[libc++][modules] Adds std module cppm files.

[Mordante]

Summary

This adds the cppm files of D144994. These files by themselves will do
nothing. The goal is to reduce the size of D144994 and making it easier
to review the real changes of the patch.

Implements parts of

• P2465R3 Standard Library Modules std and std.compat

[aaronmondal]

libcxx/modules/std/new.cppm

14

I wonder whether it would be better to name this file __new.cppm, so that it's more straightforward to generate the module partition name from the filename. Otherwise this needs special treatment in build files.

Then again, that would make the filename inconsistent with the others. Ahh what a dilemma 😅

[Mordante]

libcxx/modules/std/new.cppm

14

For CMake I have a hard-coded list where I can use __new.cppm or new.cppm. (That CMake file's not part of this review since this review should be about adding these files and no logic.)

When this makes it easier for you I've no objection against renaming this file.

[aaronmondal]

libcxx/modules/std/new.cppm

14

Hmm thinking about this some more I think renaming would be better. It's not exactly making integration harder, but it does add some avoidable complexity:

interfaces = {
    "modules/std/{}.cppm".format(name): "std:{}".format(name)
    for name in STD_PARTITIONS
} | {
    "modules/std/new.cppm": "std:__new",
},

[ChuanqiXu]

I just took a look at it and it looks almost fine. I can't be sure if there is anything missing. But it may be better to decide this by testing instead of by eyes. So this looks good to me.

libcxx/modules/std/vector.cppm

21

It looks better if we can use meaningful name like #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS.

[Mordante]

In D151030#4359443, @ChuanqiXu wrote:

I just took a look at it and it looks almost fine. I can't be sure if there is anything missing. But it may be better to decide this by testing instead of by eyes. So this looks good to me.

This has indeed been tested by a test script in D144994. That script has found quite some errors I made. It also helped a lot to update the .cppm files after rebasing. It now matches the current implementation status of libc++. Once the rest of the infrastructure lands this script will make sure the CI fails when the headers and the .cppm are out of sync.

libcxx/modules/std/new.cppm

14

Unfortunately I noticed there is an issue with renaming. I have a script that tests whether module foo matches header foo. That test would break with the rename.

Just curious do you really need to use the partitions directly. The Standard doesn't mandate any partitions, I could have dumped all declarations in one big .cppm file and be compliant. (Obviously that would be a maintenance nightmare.)

libcxx/modules/std/vector.cppm

21

I expect these to be short-lived @H-G-Hristov is putting quite some effort in implementing P1614. The #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS is intended to be forever. I've done similar things for other missing parts of headers or entire headers. For example print.cppm exists but libc++ doesn't have <print> yet. (That header is being worked on but it hasn't been reviewed yet.)

[ChuanqiXu]

In D151030#4361219, @Mordante wrote:

In D151030#4359443, @ChuanqiXu wrote:

I just took a look at it and it looks almost fine. I can't be sure if there is anything missing. But it may be better to decide this by testing instead of by eyes. So this looks good to me.

This has indeed been tested by a test script in D144994. That script has found quite some errors I made. It also helped a lot to update the .cppm files after rebasing. It now matches the current implementation status of libc++. Once the rest of the infrastructure lands this script will make sure the CI fails when the headers and the .cppm are out of sync.

Got it. So this looks good to me : )

libcxx/modules/std/vector.cppm

21

Yeah, it should be up to you.

[aaronmondal]

Tested this against my downstream build files. Builds and runs on my end (with the tuple fix from D144994).

libcxx/modules/std/new.cppm

14

No worries then. That maintenance burden sounds much worse than that slight inconvenience I mentioned.

[ldionne]

This LGTM but I'd like to check in the test that pins down this content reasonably quickly after to make sure this doesn't rot. Thanks!

libcxx/modules/std.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+export module std;
+
+// The headers of Table 24: C++ library headers [tab:headers.cpp]
+// and the headers of Table 25: C++ headers for C library facilities [tab:headers.cpp.c]
+export import :__new; // Note new is a keyword and not a valid identifier
+export import :algorithm;
+export import :any;
+export import :array;
+export import :atomic;
+export import :barrier;
+export import :bit;
+export import :bitset;
+export import :cassert;
+export import :cctype;
+export import :cerrno;
+export import :cfenv;
+export import :cfloat;
+export import :charconv;
+export import :chrono;
+export import :cinttypes;
+export import :climits;
+export import :clocale;
+export import :cmath;
+export import :codecvt;
+export import :compare;
+export import :complex;
+export import :concepts;
+export import :condition_variable;
+export import :coroutine;
+export import :csetjmp;
+export import :csignal;
+export import :cstdarg;
+export import :cstddef;
+export import :cstdio;
+export import :cstdlib;
+export import :cstdint;
+export import :cstring;
+export import :ctime;
+export import :cuchar;
+export import :cwchar;
+export import :cwctype;
+export import :deque;
+export import :exception;
+export import :execution;
+export import :expected;
+export import :filesystem;
+export import :flat_map;
+export import :flat_set;
+export import :format;
+export import :forward_list;
+export import :fstream;
+export import :functional;
+export import :future;
+export import :generator;
+export import :initializer_list;
+export import :iomanip;
+export import :ios;
+export import :iosfwd;
+export import :iostream;
+export import :istream;
+export import :iterator;
+export import :latch;
+export import :limits;
+export import :list;
+export import :locale;
+export import :map;
+export import :mdspan;
+export import :memory;
+export import :memory_resource;
+export import :mutex;
+export import :numbers;
+export import :numeric;
+export import :optional;
+export import :ostream;
+export import :print;
+export import :queue;
+export import :random;
+export import :ranges;
+export import :ratio;
+export import :regex;
+export import :scoped_allocator;
+export import :semaphore;
+export import :set;
+export import :shared_mutex;
+export import :source_location;
+export import :span;
+export import :spanstream;
+export import :sstream;
+export import :stack;
+export import :stacktrace;
+export import :stdexcept;
+export import :stdfloat;
+export import :stop_token;
+export import :streambuf;
+export import :string;
+export import :string_view;
+export import :strstream;
+export import :syncstream;
+export import :system_error;
+export import :thread;
+export import :tuple;
+export import :type_traits;
+export import :typeindex;
+export import :typeinfo;
+export import :unordered_map;
+export import :unordered_set;
+export import :utility;
+export import :valarray;
+export import :variant;
+export import :vector;
+export import :version;

libcxx/modules/std/algorithm.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <algorithm>
+
+export module std:algorithm;
+export namespace std {
+  namespace ranges {
+    // [algorithms.results], algorithm result types
+    using std::ranges::in_found_result;
+    using std::ranges::in_fun_result;
+    using std::ranges::in_in_out_result;
+    using std::ranges::in_in_result;
+    using std::ranges::in_out_out_result;
+    using std::ranges::in_out_result;
+    // using std::ranges::in_value_result;
+    using std::ranges::min_max_result;
+    // using std::ranges::out_value_result;
+  } // namespace ranges
+
+  // [alg.nonmodifying], non-modifying sequence operations
+  // [alg.all.of], all of
+  using std::all_of;
+  namespace ranges {
+    using std::ranges::all_of;
+  }
+
+  // [alg.any.of], any of
+  using std::any_of;
+  namespace ranges {
+    using std::ranges::any_of;
+  }
+
+  // [alg.none.of], none of
+  using std::none_of;
+  namespace ranges {
+    using std::ranges::none_of;
+  }
+
+  // [alg.contains], contains
+#if 0
+  namespace ranges {
+    using std::ranges::contains;
+    using std::ranges::contains_subrange;
+  } // namespace ranges
+#endif
+
+  // [alg.foreach], for each
+  using std::for_each;
+
+  namespace ranges {
+    using std::ranges::for_each;
+    using std::ranges::for_each_result;
+  } // namespace ranges
+
+  using std::for_each_n;
+
+  namespace ranges {
+    using std::ranges::for_each_n_result;
+
+    using std::ranges::for_each_n;
+  } // namespace ranges
+
+  // [alg.find], find
+  using std::find;
+  using std::find_if;
+  using std::find_if_not;
+
+  namespace ranges {
+    using std::ranges::find;
+    using std::ranges::find_if;
+    using std::ranges::find_if_not;
+  } // namespace ranges
+
+  namespace ranges {
+#if 0
+    using std::ranges::find_last;
+    using std::ranges::find_last_if;
+    using std::ranges::find_last_if_not;
+#endif
+  } // namespace ranges
+
+  // [alg.find.end], find end
+  using std::find_end;
+
+  namespace ranges {
+    using std::ranges::find_end;
+  }
+
+  // [alg.find.first.of], find first
+  using std::find_first_of;
+
+  namespace ranges {
+    using std::ranges::find_first_of;
+  }
+
+  // [alg.adjacent.find], adjacent find
+  using std::adjacent_find;
+
+  namespace ranges {
+    using std::ranges::adjacent_find;
+  }
+
+  // [alg.count], count
+  using std::count;
+  using std::count_if;
+
+  namespace ranges {
+    using std::ranges::count;
+    using std::ranges::count_if;
+  } // namespace ranges
+
+  // [mismatch], mismatch
+  using std::mismatch;
+
+  namespace ranges {
+    using std::ranges::mismatch_result;
+
+    using std::ranges::mismatch;
+  } // namespace ranges
+
+  // [alg.equal], equal
+  using std::equal;
+
+  namespace ranges {
+    using std::ranges::equal;
+  }
+
+  // [alg.is.permutation], is permutation
+  using std::is_permutation;
+
+  namespace ranges {
+    using std::ranges::is_permutation;
+  }
+
+  // [alg.search], search
+  using std::search;
+
+  namespace ranges {
+    using std::ranges::search;
+  }
+
+  using std::search_n;
+
+  namespace ranges {
+    using std::ranges::search_n;
+  }
+
+  namespace ranges {
+    // [alg.starts.with], starts with
+    using std::ranges::starts_with;
+
+#if 0
+    // [alg.ends.with], ends with
+    using std::ranges::ends_with;
+
+    // [alg.fold], fold
+    using std::ranges::fold_left;
+    using std::ranges::fold_left_first;
+    using std::ranges::fold_right;
+    using std::ranges::fold_right_last;
+    using std::ranges::fold_left_with_iter;
+    using std::ranges::fold_left_with_iter_result;
+    using std::ranges::fold_left_with_iter;
+    using std::ranges::fold_left_first_with_iter;
+    using std::ranges::fold_left_first_with_iter;
+#endif
+  } // namespace ranges
+
+  // [alg.modifying.operations], mutating sequence operations
+  // [alg.copy], copy
+  using std::copy;
+
+  namespace ranges {
+    using std::ranges::copy;
+    using std::ranges::copy_result;
+  } // namespace ranges
+
+  using std::copy_n;
+
+  namespace ranges {
+    using std::ranges::copy_n;
+    using std::ranges::copy_n_result;
+  } // namespace ranges
+
+  using std::copy_if;
+
+  namespace ranges {
+    using std::ranges::copy_if;
+    using std::ranges::copy_if_result;
+  } // namespace ranges
+
+  using std::copy_backward;
+
+  namespace ranges {
+    using std::ranges::copy_backward;
+    using std::ranges::copy_backward_result;
+  } // namespace ranges
+
+  // [alg.move], move
+  using std::move;
+
+  namespace ranges {
+    using std::ranges::move;
+    using std::ranges::move_result;
+  } // namespace ranges
+
+  using std::move_backward;
+
+  namespace ranges {
+    using std::ranges::move_backward;
+    using std::ranges::move_backward_result;
+  } // namespace ranges
+
+  // [alg.swap], swap
+  using std::swap_ranges;
+
+  namespace ranges {
+    using std::ranges::swap_ranges;
+    using std::ranges::swap_ranges_result;
+  } // namespace ranges
+
+  using std::iter_swap;
+
+  // [alg.transform], transform
+  using std::transform;
+
+  namespace ranges {
+    using std::ranges::binary_transform_result;
+    using std::ranges::unary_transform_result;
+
+    using std::ranges::transform;
+
+  } // namespace ranges
+
+  using std::replace;
+  using std::replace_if;
+
+  namespace ranges {
+    using std::ranges::replace;
+    using std::ranges::replace_if;
+  } // namespace ranges
+
+  using std::replace_copy;
+  using std::replace_copy_if;
+
+  namespace ranges {
+    using std::ranges::replace_copy;
+    using std::ranges::replace_copy_if;
+    using std::ranges::replace_copy_if_result;
+    using std::ranges::replace_copy_result;
+  } // namespace ranges
+
+  // [alg.fill], fill
+  using std::fill;
+  using std::fill_n;
+
+  namespace ranges {
+    using std::ranges::fill;
+    using std::ranges::fill_n;
+  } // namespace ranges
+
+  // [alg.generate], generate
+  using std::generate;
+  using std::generate_n;
+
+  namespace ranges {
+    using std::ranges::generate;
+    using std::ranges::generate_n;
+  } // namespace ranges
+
+  // [alg.remove], remove
+  using std::remove;
+  using std::remove_if;
+
+  namespace ranges {
+    using std::ranges::remove;
+    using std::ranges::remove_if;
+  } // namespace ranges
+
+  using std::remove_copy;
+  using std::remove_copy_if;
+  namespace ranges {
+    using std::ranges::remove_copy;
+    using std::ranges::remove_copy_if;
+    using std::ranges::remove_copy_if_result;
+    using std::ranges::remove_copy_result;
+  } // namespace ranges
+
+  // [alg.unique], unique
+  using std::unique;
+
+  namespace ranges {
+    using std::ranges::unique;
+  }
+
+  using std::unique_copy;
+
+  namespace ranges {
+    using std::ranges::unique_copy;
+    using std::ranges::unique_copy_result;
+  } // namespace ranges
+
+  // [alg.reverse], reverse
+  using std::reverse;
+
+  namespace ranges {
+    using std::ranges::reverse;
+  }
+
+  using std::reverse_copy;
+
+  namespace ranges {
+    using std::ranges::reverse_copy;
+    using std::ranges::reverse_copy_result;
+  } // namespace ranges
+
+  // [alg.rotate], rotate
+  using std::rotate;
+
+  namespace ranges {
+    using std::ranges::rotate;
+  }
+
+  using std::rotate_copy;
+
+  namespace ranges {
+    using std::ranges::rotate_copy;
+    using std::ranges::rotate_copy_result;
+  } // namespace ranges
+
+  // [alg.random.sample], sample
+  using std::sample;
+
+  namespace ranges {
+    using std::ranges::sample;
+  }
+
+  // [alg.random.shuffle], shuffle
+  using std::shuffle;
+
+  namespace ranges {
+    using std::ranges::shuffle;
+  }
+
+  // [alg.shift], shift
+  using std::shift_left;
+
+  namespace ranges {
+    // using std::ranges::shift_left;
+  }
+
+  using std::shift_right;
+
+  namespace ranges {
+    // using std::ranges::shift_right;
+  }
+
+  // [alg.sorting], sorting and related operations
+  // [alg.sort], sorting
+  using std::sort;
+
+  namespace ranges {
+    using std::ranges::sort;
+  }
+
+  using std::stable_sort;
+
+  namespace ranges {
+    using std::ranges::stable_sort;
+  }
+
+  using std::partial_sort;
+
+  namespace ranges {
+    using std::ranges::partial_sort;
+  }
+  using std::partial_sort_copy;
+
+  namespace ranges {
+    using std::ranges::partial_sort_copy;
+    using std::ranges::partial_sort_copy_result;
+  } // namespace ranges
+
+  using std::is_sorted;
+  using std::is_sorted_until;
+
+  namespace ranges {
+    using std::ranges::is_sorted;
+    using std::ranges::is_sorted_until;
+  } // namespace ranges
+
+  // [alg.nth.element], Nth element
+  using std::nth_element;
+
+  namespace ranges {
+    using std::ranges::nth_element;
+  }
+
+  // [alg.binary.search], binary search
+  using std::lower_bound;
+
+  namespace ranges {
+    using std::ranges::lower_bound;
+  }
+
+  using std::upper_bound;
+
+  namespace ranges {
+    using std::ranges::upper_bound;
+  }
+
+  using std::equal_range;
+
+  namespace ranges {
+    using std::ranges::equal_range;
+  }
+
+  using std::binary_search;
+
+  namespace ranges {
+    using std::ranges::binary_search;
+  }
+
+  // [alg.partitions], partitions
+  using std::is_partitioned;
+
+  namespace ranges {
+    using std::ranges::is_partitioned;
+  }
+
+  using std::partition;
+
+  namespace ranges {
+    using std::ranges::partition;
+  }
+
+  using std::stable_partition;
+
+  namespace ranges {
+    using std::ranges::stable_partition;
+  }
+
+  using std::partition_copy;
+
+  namespace ranges {
+    using std::ranges::partition_copy;
+    using std::ranges::partition_copy_result;
+  } // namespace ranges
+
+  using std::partition_point;
+
+  namespace ranges {
+    using std::ranges::partition_point;
+  }
+  // [alg.merge], merge
+  using std::merge;
+  namespace ranges {
+    using std::ranges::merge;
+    using std::ranges::merge_result;
+  } // namespace ranges
+
+  using std::inplace_merge;
+
+  namespace ranges {
+    using std::ranges::inplace_merge;
+  }
+
+  // [alg.set.operations], set operations
+  using std::includes;
+  namespace ranges {
+    using std::ranges::includes;
+  }
+
+  using std::set_union;
+
+  namespace ranges {
+    using std::ranges::set_union;
+    using std::ranges::set_union_result;
+  } // namespace ranges
+
+  using std::set_intersection;
+  namespace ranges {
+    using std::ranges::set_intersection;
+    using std::ranges::set_intersection_result;
+  } // namespace ranges
+
+  using std::set_difference;
+
+  namespace ranges {
+    using std::ranges::set_difference;
+    using std::ranges::set_difference_result;
+  } // namespace ranges
+
+  using std::set_symmetric_difference;
+
+  namespace ranges {
+    using std::ranges::set_symmetric_difference_result;
+
+    using std::ranges::set_symmetric_difference;
+  } // namespace ranges
+
+  // [alg.heap.operations], heap operations
+  using std::push_heap;
+
+  namespace ranges {
+    using std::ranges::push_heap;
+  }
+
+  using std::pop_heap;
+
+  namespace ranges {
+    using std::ranges::pop_heap;
+  }
+
+  using std::make_heap;
+
+  namespace ranges {
+    using std::ranges::make_heap;
+  }
+
+  using std::sort_heap;
+
+  namespace ranges {
+    using std::ranges::sort_heap;
+  }
+
+  using std::is_heap;
+
+  namespace ranges {
+    using std::ranges::is_heap;
+  }
+
+  using std::is_heap_until;
+
+  namespace ranges {
+    using std::ranges::is_heap_until;
+  }
+
+  // [alg.min.max], minimum and maximum
+  using std::min;
+
+  namespace ranges {
+    using std::ranges::min;
+  }
+
+  using std::max;
+
+  namespace ranges {
+    using std::ranges::max;
+  }
+
+  using std::minmax;
+
+  namespace ranges {
+    using std::ranges::minmax_result;
+
+    using std::ranges::minmax;
+  } // namespace ranges
+
+  using std::min_element;
+
+  namespace ranges {
+    using std::ranges::min_element;
+  }
+
+  using std::max_element;
+
+  namespace ranges {
+    using std::ranges::max_element;
+  }
+
+  using std::minmax_element;
+
+  namespace ranges {
+    using std::ranges::minmax_element_result;
+
+    using std::ranges::minmax_element;
+  } // namespace ranges
+    // [alg.clamp], bounded value
+  using std::clamp;
+
+  namespace ranges {
+    using std::ranges::clamp;
+  }
+
+  // [alg.lex.comparison], lexicographical comparison
+  using std::lexicographical_compare;
+
+  namespace ranges {
+    using std::ranges::lexicographical_compare;
+  }
+
+  // [alg.three.way], three-way comparison algorithms
+  using std::lexicographical_compare_three_way;
+
+  // [alg.permutation.generators], permutations
+  using std::next_permutation;
+
+  namespace ranges {
+    using std::ranges::next_permutation_result;
+
+    using std::ranges::next_permutation;
+  } // namespace ranges
+
+  using std::prev_permutation;
+
+  namespace ranges {
+    using std::ranges::prev_permutation_result;
+
+    using std::ranges::prev_permutation;
+  } // namespace ranges
+
+} // namespace std

libcxx/modules/std/any.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <any>
+
+export module std:any;
+export namespace std {
+
+  // [any.bad.any.cast], class bad_any_cast
+  using std::bad_any_cast;
+
+  // [any.class], class any
+  using std::any;
+
+  // [any.nonmembers], non-member functions
+  using std::any_cast;
+  using std::make_any;
+  using std::swap;
+
+} // namespace std

libcxx/modules/std/array.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <array>
+
+export module std:array;
+export namespace std {
+
+  // [array], class template array
+  using std::array;
+
+  using std::operator==;
+  using std::operator<=>;
+
+  // [array.special], specialized algorithms
+  using std::swap;
+
+  // [array.creation], array creation functions
+  using std::to_array;
+
+  // [array.tuple], tuple interface
+  using std::get;
+  using std::tuple_element;
+  using std::tuple_size;
+
+} // namespace std

libcxx/modules/std/atomic.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <atomic>
+
+export module std:atomic;
+export namespace std {
+
+  // [atomics.order], order and consistency
+  using std::memory_order;
+  using std::memory_order_acq_rel;
+  using std::memory_order_acquire;
+  using std::memory_order_consume;
+  using std::memory_order_relaxed;
+  using std::memory_order_release;
+  using std::memory_order_seq_cst;
+
+  using std::kill_dependency;
+} // namespace std
+
+namespace std {
+
+  // [atomics.ref.generic], class template atomic_ref
+  // [atomics.ref.pointer], partial specialization for pointers
+  // using std::atomic_ref;
+
+  // [atomics.types.generic], class template atomic
+  using std::atomic;
+
+  // [atomics.nonmembers], non-member functions
+  using std::atomic_compare_exchange_strong;
+  using std::atomic_compare_exchange_strong_explicit;
+  using std::atomic_compare_exchange_weak;
+  using std::atomic_compare_exchange_weak_explicit;
+  using std::atomic_exchange;
+  using std::atomic_exchange_explicit;
+  using std::atomic_is_lock_free;
+  using std::atomic_load;
+  using std::atomic_load_explicit;
+  using std::atomic_store;
+  using std::atomic_store_explicit;
+
+  using std::atomic_fetch_add;
+  using std::atomic_fetch_add_explicit;
+  using std::atomic_fetch_and;
+  using std::atomic_fetch_and_explicit;
+  using std::atomic_fetch_or;
+  using std::atomic_fetch_or_explicit;
+  using std::atomic_fetch_sub;
+  using std::atomic_fetch_sub_explicit;
+  using std::atomic_fetch_xor;
+  using std::atomic_fetch_xor_explicit;
+  using std::atomic_notify_all;
+  using std::atomic_notify_one;
+  using std::atomic_wait;
+  using std::atomic_wait_explicit;
+
+  // [atomics.alias], type aliases
+  using std::atomic_bool;
+  using std::atomic_char;
+  using std::atomic_char16_t;
+  using std::atomic_char32_t;
+  using std::atomic_char8_t;
+  using std::atomic_int;
+  using std::atomic_llong;
+  using std::atomic_long;
+  using std::atomic_schar;
+  using std::atomic_short;
+  using std::atomic_uchar;
+  using std::atomic_uint;
+  using std::atomic_ullong;
+  using std::atomic_ulong;
+  using std::atomic_ushort;
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::atomic_wchar_t;
+#endif
+
+  using std::atomic_int16_t;
+  using std::atomic_int32_t;
+  using std::atomic_int64_t;
+  using std::atomic_int8_t;
+  using std::atomic_uint16_t;
+  using std::atomic_uint32_t;
+  using std::atomic_uint64_t;
+  using std::atomic_uint8_t;
+
+  using std::atomic_int_least16_t;
+  using std::atomic_int_least32_t;
+  using std::atomic_int_least64_t;
+  using std::atomic_int_least8_t;
+  using std::atomic_uint_least16_t;
+  using std::atomic_uint_least32_t;
+  using std::atomic_uint_least64_t;
+  using std::atomic_uint_least8_t;
+
+  using std::atomic_int_fast16_t;
+  using std::atomic_int_fast32_t;
+  using std::atomic_int_fast64_t;
+  using std::atomic_int_fast8_t;
+  using std::atomic_uint_fast16_t;
+  using std::atomic_uint_fast32_t;
+  using std::atomic_uint_fast64_t;
+  using std::atomic_uint_fast8_t;
+
+  using std::atomic_intmax_t;
+  using std::atomic_intptr_t;
+  using std::atomic_ptrdiff_t;
+  using std::atomic_size_t;
+  using std::atomic_uintmax_t;
+  using std::atomic_uintptr_t;
+
+  using std::atomic_signed_lock_free;
+  using std::atomic_unsigned_lock_free;
+
+  // [atomics.flag], flag type and operations
+  using std::atomic_flag;
+
+  using std::atomic_flag_clear;
+  using std::atomic_flag_clear_explicit;
+  using std::atomic_flag_test;
+  using std::atomic_flag_test_and_set;
+  using std::atomic_flag_test_and_set_explicit;
+  using std::atomic_flag_test_explicit;
+
+  using std::atomic_flag_notify_all;
+  using std::atomic_flag_notify_one;
+  using std::atomic_flag_wait;
+  using std::atomic_flag_wait_explicit;
+
+  // [atomics.fences], fences
+  using std::atomic_signal_fence;
+  using std::atomic_thread_fence;
+
+  // [depr.atomics.nonmembers]
+  using std::atomic_init;
+
+} // namespace std

libcxx/modules/std/barrier.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <barrier>
+
+export module std:barrier;
+export namespace std {
+  using std::barrier;
+} // namespace std

libcxx/modules/std/bit.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <bit>
+
+export module std:bit;
+export namespace std {
+  // [bit.cast], bit_cast
+  using std::bit_cast;
+
+  // [bit.byteswap], byteswap
+  using std::byteswap;
+
+  // [bit.pow.two], integral powers of 2
+  using std::bit_ceil;
+  using std::bit_floor;
+  using std::bit_width;
+  using std::has_single_bit;
+
+  // [bit.rotate], rotating
+  using std::rotl;
+  using std::rotr;
+
+  // [bit.count], counting
+  using std::countl_one;
+  using std::countl_zero;
+  using std::countr_one;
+  using std::countr_zero;
+  using std::popcount;
+
+  // [bit.endian], endian
+  using std::endian;
+} // namespace std

libcxx/modules/std/bitset.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <bitset>
+
+export module std:bitset;
+export namespace std {
+  using std::bitset;
+
+  // [bitset.operators], bitset operators
+  using std::operator&;
+  using std::operator|;
+  using std::operator^;
+  using std::operator>>;
+  using std::operator<<;
+
+  // [bitset.hash], hash support
+  using std::hash;
+
+} // namespace std

libcxx/modules/std/cassert.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cassert>
+
+export module std:cassert;
+export namespace std {
+  // This module exports nothing.
+} // namespace std

libcxx/modules/std/cctype.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cctype>
+
+export module std:cctype;
+export namespace std {
+  using std::isalnum;
+  using std::isalpha;
+  using std::isblank;
+  using std::iscntrl;
+  using std::isdigit;
+  using std::isgraph;
+  using std::islower;
+  using std::isprint;
+  using std::ispunct;
+  using std::isspace;
+  using std::isupper;
+  using std::isxdigit;
+  using std::tolower;
+  using std::toupper;
+} // namespace std

libcxx/modules/std/cerrno.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cerrno>
+
+export module std:cerrno;
+export namespace std {
+  // This module exports nothing.
+} // namespace std

libcxx/modules/std/cfenv.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cfenv>
+
+export module std:cfenv;
+export namespace std {
+  // types
+  using std::fenv_t;
+  using std::fexcept_t;
+
+  // functions
+  using std::feclearexcept;
+  using std::fegetexceptflag;
+  using std::feraiseexcept;
+  using std::fesetexceptflag;
+  using std::fetestexcept;
+
+  using std::fegetround;
+  using std::fesetround;
+
+  using std::fegetenv;
+  using std::feholdexcept;
+  using std::fesetenv;
+  using std::feupdateenv;
+
+} // namespace std

libcxx/modules/std/cfloat.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cfloat>
+
+export module std:cfloat;
+export namespace std {
+  // This module exports nothing.
+} // namespace std

libcxx/modules/std/charconv.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <charconv>
+
+export module std:charconv;
+export namespace std {
+
+  // floating-point format for primitive numerical conversion
+  using std::chars_format;
+
+  // chars_format is a bitmask type.
+  // [bitmask.types] specified operators
+  using std::operator&;
+  using std::operator&=;
+  using std::operator^;
+  using std::operator^=;
+  using std::operator|;
+  using std::operator|=;
+  using std::operator~;
+
+  // [charconv.to.chars], primitive numerical output conversion
+  using std::to_chars_result;
+
+  using std::to_chars;
+
+  // [charconv.from.chars], primitive numerical input conversion
+  using std::from_chars_result;
+
+  using std::from_chars;
+} // namespace std

libcxx/modules/std/chrono.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <chrono>
+
+export module std:chrono;
+export namespace std {
+
+  namespace chrono {
+    using std::chrono::duration;
+    using std::chrono::time_point;
+
+  } // namespace chrono
+
+  using std::common_type;
+
+  namespace chrono {
+
+    // [time.traits], customization traits
+    using std::chrono::treat_as_floating_point;
+    using std::chrono::treat_as_floating_point_v;
+
+    using std::chrono::duration_values;
+
+    // using std::chrono::is_clock;
+    // using std::chrono::is_clock_v;
+
+    // [time.duration.nonmember], duration arithmetic
+    using std::chrono::operator+;
+    using std::chrono::operator-;
+    using std::chrono::operator*;
+    using std::chrono::operator/;
+    using std::chrono::operator%;
+
+    // [time.duration.comparisons], duration comparisons
+    using std::chrono::operator==;
+    using std::chrono::operator!=;
+    using std::chrono::operator<;
+    using std::chrono::operator>;
+    using std::chrono::operator<=;
+    using std::chrono::operator>=;
+    using std::chrono::operator<=>;
+
+    // [time.duration.cast], conversions
+    using std::chrono::ceil;
+    using std::chrono::duration_cast;
+    using std::chrono::floor;
+    using std::chrono::round;
+
+    // [time.duration.io], duration I/O
+#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+    using std::chrono::operator<<;
+#endif
+    // using std::chrono::from_stream;
+
+    // convenience typedefs
+    using std::chrono::days;
+    using std::chrono::hours;
+    using std::chrono::microseconds;
+    using std::chrono::milliseconds;
+    using std::chrono::minutes;
+    using std::chrono::months;
+    using std::chrono::nanoseconds;
+    using std::chrono::seconds;
+    using std::chrono::weeks;
+    using std::chrono::years;
+
+    // [time.point.nonmember], time_point arithmetic
+
+    // [time.point.comparisons], time_point comparisons
+
+    // [time.point.cast], conversions
+    using std::chrono::time_point_cast;
+
+    // [time.duration.alg], specialized algorithms
+    using std::chrono::abs;
+
+    // [time.clock.system], class system_clock
+    using std::chrono::system_clock;
+
+    using std::chrono::sys_days;
+    using std::chrono::sys_seconds;
+    using std::chrono::sys_time;
+
+#if 0
+    // [time.clock.utc], class utc_clock
+    using std::chrono::utc_clock;
+
+    using std::chrono::utc_seconds;
+    using std::chrono::utc_time;
+
+    using std::chrono::leap_second_info;
+
+    using std::chrono::get_leap_second_info;
+    // [time.clock.tai], class tai_clock
+    using std::chrono::tai_clock;
+
+    using std::chrono::tai_seconds;
+    using std::chrono::tai_time;
+
+    // [time.clock.gps], class gps_clock
+    using std::chrono::gps_clock;
+
+    using std::chrono::gps_seconds;
+    using std::chrono::gps_time;
+#endif
+    // [time.clock.file], type file_clock
+    using std::chrono::file_clock;
+
+    using std::chrono::file_time;
+
+    // [time.clock.steady], class steady_clock
+    using std::chrono::steady_clock;
+
+    // [time.clock.hires], class high_resolution_clock
+    using std::chrono::high_resolution_clock;
+
+    // [time.clock.local], local time
+    using std::chrono::local_days;
+    using std::chrono::local_seconds;
+    using std::chrono::local_t;
+    using std::chrono::local_time;
+
+    // [time.clock.cast], time_point conversions
+    // using std::chrono::clock_time_conversion;
+
+    // using std::chrono::clock_cast;
+
+    // [time.cal.last], class last_spec
+    using std::chrono::last_spec;
+
+    // [time.cal.day], class day
+    using std::chrono::day;
+
+    // [time.cal.month], class month
+    using std::chrono::month;
+
+    // [time.cal.year], class year
+    using std::chrono::year;
+
+    // [time.cal.wd], class weekday
+    using std::chrono::weekday;
+
+    // [time.cal.wdidx], class weekday_indexed
+    using std::chrono::weekday_indexed;
+
+    // [time.cal.wdlast], class weekday_last
+    using std::chrono::weekday_last;
+
+    // [time.cal.md], class month_day
+    using std::chrono::month_day;
+
+    // [time.cal.mdlast], class month_day_last
+    using std::chrono::month_day_last;
+
+    // [time.cal.mwd], class month_weekday
+    using std::chrono::month_weekday;
+
+    // [time.cal.mwdlast], class month_weekday_last
+    using std::chrono::month_weekday_last;
+
+    // [time.cal.ym], class year_month
+    using std::chrono::year_month;
+
+    // [time.cal.ymd], class year_month_day
+    using std::chrono::year_month_day;
+
+    // [time.cal.ymdlast], class year_month_day_last
+    using std::chrono::year_month_day_last;
+
+    // [time.cal.ymwd], class year_month_weekday
+    using std::chrono::year_month_weekday;
+
+    // [time.cal.ymwdlast], class year_month_weekday_last
+    using std::chrono::year_month_weekday_last;
+
+    // [time.cal.operators], civil calendar conventional syntax operators
+
+    // [time.hms], class template hh_mm_ss
+    using std::chrono::hh_mm_ss;
+
+    // [time.12], 12/24 hour functions
+    using std::chrono::is_am;
+    using std::chrono::is_pm;
+    using std::chrono::make12;
+    using std::chrono::make24;
+
+#if 0
+    // [time.zone.db], time zone database
+    using std::chrono::tzdb;
+    using std::chrono::tzdb_list;
+
+    // [time.zone.db.access], time zone database access
+    using std::chrono::current_zone;
+    using std::chrono::get_tzdb;
+    using std::chrono::get_tzdb_list;
+    using std::chrono::locate_zone;
+
+    // [time.zone.db.remote], remote time zone database support
+    using std::chrono::reload_tzdb;
+    using std::chrono::remote_version;
+
+    // [time.zone.exception], exception classes
+    using std::chrono::ambiguous_local_time;
+    using std::chrono::nonexistent_local_time;
+
+    // [time.zone.info], information classes
+    using std::chrono::sys_info;
+
+    // [time.zone.timezone], class time_zone
+    using std::chrono::choose;
+    using std::chrono::time_zone;
+
+    // [time.zone.zonedtraits], class template zoned_traits
+    using std::chrono::zoned_traits;
+
+    // [time.zone.zonedtime], class template zoned_time
+    using std::chrono::zoned_time;
+
+    using std::chrono::zoned_seconds;
+
+    // [time.zone.leap], leap second support
+    using std::chrono::leap_second;
+
+    // [time.zone.link], class time_zone_link
+    using std::chrono::time_zone_link;
+
+    // [time.format], formatting
+    using std::chrono::local_time_format;
+#endif
+  } // namespace chrono
+
+  using std::formatter;
+
+  namespace chrono {
+    // using std::chrono::parse;
+
+    // calendrical constants
+    using std::chrono::last;
+
+    using std::chrono::Friday;
+    using std::chrono::Monday;
+    using std::chrono::Saturday;
+    using std::chrono::Sunday;
+    using std::chrono::Thursday;
+    using std::chrono::Tuesday;
+    using std::chrono::Wednesday;
+
+    using std::chrono::April;
+    using std::chrono::August;
+    using std::chrono::December;
+    using std::chrono::February;
+    using std::chrono::January;
+    using std::chrono::July;
+    using std::chrono::June;
+    using std::chrono::March;
+    using std::chrono::May;
+    using std::chrono::November;
+    using std::chrono::October;
+    using std::chrono::September;
+
+  } // namespace chrono
+
+} // namespace std
+export namespace std::inline literals::inline chrono_literals {
+  // [time.duration.literals], suffixes for duration literals
+  using std::literals::chrono_literals::operator""h;
+  using std::literals::chrono_literals::operator""min;
+  using std::literals::chrono_literals::operator""s;
+  using std::literals::chrono_literals::operator""ms;
+  using std::literals::chrono_literals::operator""us;
+  using std::literals::chrono_literals::operator""ns;
+
+  // [using std::literals::chrono_literals::.cal.day.nonmembers], non-member functions
+  using std::literals::chrono_literals::operator""d;
+
+  // [using std::literals::chrono_literals::.cal.year.nonmembers], non-member functions
+  using std::literals::chrono_literals::operator""y;
+} // namespace std::inline literals::inline chrono_literals

libcxx/modules/std/cinttypes.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cinttypes>
+
+export module std:cinttypes;
+export namespace std {
+  using std::imaxdiv_t;
+
+  using std::imaxabs;
+  using std::imaxdiv;
+  using std::strtoimax;
+  using std::strtoumax;
+  using std::wcstoimax;
+  using std::wcstoumax;
+
+  // abs is conditionally here, but always present in cmath.cppm. To avoid
+  // conflicing declarations omit the using here.
+
+  // div is conditionally here, but always present in cstdlib.cppm. To avoid
+  // conflicing declarations omit the using here.
+} // namespace std

libcxx/modules/std/climits.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <climits>
+
+export module std:climits;
+export namespace std {
+  // This module exports nothing.
+} // namespace std

libcxx/modules/std/clocale.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <clocale>
+#endif
+
+export module std:clocale;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::lconv;
+
+  using std::localeconv;
+  using std::setlocale;
+
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/cmath.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cmath>
+
+export module std:cmath;
+export namespace std {
+
+  using std::double_t;
+  using std::float_t;
+
+  using std::acos;
+  using std::acosf;
+  using std::acosl;
+
+  using std::asin;
+  using std::asinf;
+  using std::asinl;
+
+  using std::atan;
+  using std::atanf;
+  using std::atanl;
+
+  using std::atan2;
+  using std::atan2f;
+  using std::atan2l;
+
+  using std::cos;
+  using std::cosf;
+  using std::cosl;
+
+  using std::sin;
+  using std::sinf;
+  using std::sinl;
+
+  using std::tan;
+  using std::tanf;
+  using std::tanl;
+
+  using std::acosh;
+  using std::acoshf;
+  using std::acoshl;
+
+  using std::asinh;
+  using std::asinhf;
+  using std::asinhl;
+
+  using std::atanh;
+  using std::atanhf;
+  using std::atanhl;
+
+  using std::cosh;
+  using std::coshf;
+  using std::coshl;
+
+  using std::sinh;
+  using std::sinhf;
+  using std::sinhl;
+
+  using std::tanh;
+  using std::tanhf;
+  using std::tanhl;
+
+  using std::exp;
+  using std::expf;
+  using std::expl;
+
+  using std::exp2;
+  using std::exp2f;
+  using std::exp2l;
+
+  using std::expm1;
+  using std::expm1f;
+  using std::expm1l;
+
+  using std::frexp;
+  using std::frexpf;
+  using std::frexpl;
+
+  using std::ilogb;
+  using std::ilogbf;
+  using std::ilogbl;
+
+  using std::ldexp;
+  using std::ldexpf;
+  using std::ldexpl;
+
+  using std::log;
+  using std::logf;
+  using std::logl;
+
+  using std::log10;
+  using std::log10f;
+  using std::log10l;
+
+  using std::log1p;
+  using std::log1pf;
+  using std::log1pl;
+
+  using std::log2;
+  using std::log2f;
+  using std::log2l;
+
+  using std::logb;
+  using std::logbf;
+  using std::logbl;
+
+  using std::modf;
+  using std::modff;
+  using std::modfl;
+
+  using std::scalbn;
+  using std::scalbnf;
+  using std::scalbnl;
+
+  using std::scalbln;
+  using std::scalblnf;
+  using std::scalblnl;
+
+  using std::cbrt;
+  using std::cbrtf;
+  using std::cbrtl;
+
+  // [c.math.abs], absolute values
+  using std::abs;
+
+  using std::fabs;
+  using std::fabsf;
+  using std::fabsl;
+
+  using std::hypot;
+  using std::hypotf;
+  using std::hypotl;
+
+  // [c.math.hypot3], three-dimensional hypotenuse
+  using std::hypot;
+
+  using std::pow;
+  using std::powf;
+  using std::powl;
+
+  using std::sqrt;
+  using std::sqrtf;
+  using std::sqrtl;
+
+  using std::erf;
+  using std::erff;
+  using std::erfl;
+
+  using std::erfc;
+  using std::erfcf;
+  using std::erfcl;
+
+  using std::lgamma;
+  using std::lgammaf;
+  using std::lgammal;
+
+  using std::tgamma;
+  using std::tgammaf;
+  using std::tgammal;
+
+  using std::ceil;
+  using std::ceilf;
+  using std::ceill;
+
+  using std::floor;
+  using std::floorf;
+  using std::floorl;
+
+  using std::nearbyint;
+  using std::nearbyintf;
+  using std::nearbyintl;
+
+  using std::rint;
+  using std::rintf;
+  using std::rintl;
+
+  using std::lrint;
+  using std::lrintf;
+  using std::lrintl;
+
+  using std::llrint;
+  using std::llrintf;
+  using std::llrintl;
+
+  using std::round;
+  using std::roundf;
+  using std::roundl;
+
+  using std::lround;
+  using std::lroundf;
+  using std::lroundl;
+
+  using std::llround;
+  using std::llroundf;
+  using std::llroundl;
+
+  using std::trunc;
+  using std::truncf;
+  using std::truncl;
+
+  using std::fmod;
+  using std::fmodf;
+  using std::fmodl;
+
+  using std::remainder;
+  using std::remainderf;
+  using std::remainderl;
+
+  using std::remquo;
+  using std::remquof;
+  using std::remquol;
+
+  using std::copysign;
+  using std::copysignf;
+  using std::copysignl;
+
+  using std::nan;
+  using std::nanf;
+  using std::nanl;
+
+  using std::nextafter;
+  using std::nextafterf;
+  using std::nextafterl;
+
+  using std::nexttoward;
+  using std::nexttowardf;
+  using std::nexttowardl;
+
+  using std::fdim;
+  using std::fdimf;
+  using std::fdiml;
+
+  using std::fmax;
+  using std::fmaxf;
+  using std::fmaxl;
+
+  using std::fmin;
+  using std::fminf;
+  using std::fminl;
+
+  using std::fma;
+  using std::fmaf;
+  using std::fmal;
+
+  // [c.math.lerp], linear interpolation
+  using std::lerp;
+
+  // [c.math.fpclass], classification / comparison functions
+  using std::fpclassify;
+  using std::isfinite;
+  using std::isgreater;
+  using std::isgreaterequal;
+  using std::isinf;
+  using std::isless;
+  using std::islessequal;
+  using std::islessgreater;
+  using std::isnan;
+  using std::isnormal;
+  using std::isunordered;
+  using std::signbit;
+
+  // [sf.cmath], mathematical special functions
+#if 0
+  // [sf.cmath.assoc.laguerre], associated Laguerre polynomials
+  using std::assoc_laguerre;
+  using std::assoc_laguerref;
+  using std::assoc_laguerrel;
+
+  // [sf.cmath.assoc.legendre], associated Legendre functions
+  using std::assoc_legendre;
+  using std::assoc_legendref;
+  using std::assoc_legendrel;
+
+  // [sf.cmath.beta], beta function
+  using std::beta;
+  using std::betaf;
+  using std::betal;
+
+  // [sf.cmath.comp.ellint.1], complete elliptic integral of the first kind
+  using std::comp_ellint_1;
+  using std::comp_ellint_1f;
+  using std::comp_ellint_1l;
+
+  // [sf.cmath.comp.ellint.2], complete elliptic integral of the second kind
+  using std::comp_ellint_2;
+  using std::comp_ellint_2f;
+  using std::comp_ellint_2l;
+
+  // [sf.cmath.comp.ellint.3], complete elliptic integral of the third kind
+  using std::comp_ellint_3;
+  using std::comp_ellint_3f;
+  using std::comp_ellint_3l;
+
+  // [sf.cmath.cyl.bessel.i], regular modified cylindrical Bessel functions
+  using std::cyl_bessel_i;
+  using std::cyl_bessel_if;
+  using std::cyl_bessel_il;
+
+  // [sf.cmath.cyl.bessel.j], cylindrical Bessel functions of the first kind
+  using std::cyl_bessel_j;
+  using std::cyl_bessel_jf;
+  using std::cyl_bessel_jl;
+
+  // [sf.cmath.cyl.bessel.k], irregular modified cylindrical Bessel functions
+  using std::cyl_bessel_k;
+  using std::cyl_bessel_kf;
+  using std::cyl_bessel_kl;
+
+  // [sf.cmath.cyl.neumann], cylindrical Neumann functions
+  // cylindrical Bessel functions of the second kind
+  using std::cyl_neumann;
+  using std::cyl_neumannf;
+  using std::cyl_neumannl;
+
+  // [sf.cmath.ellint.1], incomplete elliptic integral of the first kind
+  using std::ellint_1;
+  using std::ellint_1f;
+  using std::ellint_1l;
+
+  // [sf.cmath.ellint.2], incomplete elliptic integral of the second kind
+  using std::ellint_2;
+  using std::ellint_2f;
+  using std::ellint_2l;
+
+  // [sf.cmath.ellint.3], incomplete elliptic integral of the third kind
+  using std::ellint_3;
+  using std::ellint_3f;
+  using std::ellint_3l;
+
+  // [sf.cmath.expint], exponential integral
+  using std::expint;
+  using std::expintf;
+  using std::expintl;
+
+  // [sf.cmath.hermite], Hermite polynomials
+  using std::hermite;
+  using std::hermitef;
+  using std::hermitel;
+
+  // [sf.cmath.laguerre], Laguerre polynomials
+  using std::laguerre;
+  using std::laguerref;
+  using std::laguerrel;
+
+  // [sf.cmath.legendre], Legendre polynomials
+  using std::legendre;
+  using std::legendref;
+  using std::legendrel;
+
+  // [sf.cmath.riemann.zeta], Riemann zeta function
+  using std::riemann_zeta;
+  using std::riemann_zetaf;
+  using std::riemann_zetal;
+
+  // [sf.cmath.sph.bessel], spherical Bessel functions of the first kind
+  using std::sph_bessel;
+  using std::sph_besself;
+  using std::sph_bessell;
+
+  // [sf.cmath.sph.legendre], spherical associated Legendre functions
+  using std::sph_legendre;
+  using std::sph_legendref;
+  using std::sph_legendrel;
+
+  // [sf.cmath.sph.neumann], spherical Neumann functions;
+  // spherical Bessel functions of the second kind
+  using std::sph_neumann;
+  using std::sph_neumannf;
+  using std::sph_neumannl;
+#endif
+} // namespace std

libcxx/modules/std/codecvt.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <codecvt>
+#endif
+
+export module std:codecvt;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+
+  using std::codecvt_mode;
+
+  using std::codecvt_utf16;
+  using std::codecvt_utf8;
+  using std::codecvt_utf8_utf16;
+
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/compare.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <compare>
+
+export module std:compare;
+export namespace std {
+
+  // [cmp.categories], comparison category types
+  using std::partial_ordering;
+  using std::strong_ordering;
+  using std::weak_ordering;
+
+  // named comparison functions
+  using std::is_eq;
+  using std::is_gt;
+  using std::is_gteq;
+  using std::is_lt;
+  using std::is_lteq;
+  using std::is_neq;
+
+  // [cmp.common], common comparison category type
+  using std::common_comparison_category;
+  using std::common_comparison_category_t;
+
+  // [cmp.concept], concept three_way_comparable
+  using std::three_way_comparable;
+  using std::three_way_comparable_with;
+
+  // [cmp.result], result of three-way comparison
+  using std::compare_three_way_result;
+
+  using std::compare_three_way_result_t;
+
+  // [comparisons.three.way], class compare_three_way
+  using std::compare_three_way;
+
+  // [cmp.alg], comparison algorithms
+  inline namespace __cpo {
+    using std::__cpo::compare_partial_order_fallback;
+    using std::__cpo::compare_strong_order_fallback;
+    using std::__cpo::compare_weak_order_fallback;
+    using std::__cpo::partial_order;
+    using std::__cpo::strong_order;
+    using std::__cpo::weak_order;
+  } // namespace __cpo
+
+} // namespace std

libcxx/modules/std/complex.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <complex>
+
+export module std:complex;
+export namespace std {
+
+  // [complex], class template complex
+  using std::complex;
+
+  // [complex.ops], operators
+  using std::operator+;
+  using std::operator-;
+  using std::operator*;
+  using std::operator/;
+
+  using std::operator==;
+#if 1 // P1614
+  using std::operator!=;
+#endif
+  using std::operator>>;
+  using std::operator<<;
+
+  // [complex.value.ops], values
+  using std::imag;
+  using std::real;
+
+  using std::abs;
+  using std::arg;
+  using std::norm;
+
+  using std::conj;
+  using std::polar;
+  using std::proj;
+
+  // [complex.transcendentals], transcendentals
+  using std::acos;
+  using std::asin;
+  using std::atan;
+
+  using std::acosh;
+  using std::asinh;
+  using std::atanh;
+
+  using std::cos;
+  using std::cosh;
+  using std::exp;
+  using std::log;
+  using std::log10;
+
+  using std::pow;
+
+  using std::sin;
+  using std::sinh;
+  using std::sqrt;
+  using std::tan;
+  using std::tanh;
+
+  // [complex.literals], complex literals
+  inline namespace literals {
+    inline namespace complex_literals {
+      using std::operator""il;
+      using std::operator""i;
+      using std::operator""if;
+    } // namespace complex_literals
+  }   // namespace literals
+
+} // namespace std

libcxx/modules/std/concepts.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <concepts>
+
+export module std:concepts;
+export namespace std {
+
+  // [concepts.lang], language-related concepts
+  // [concept.same], concept same_as
+  using std::same_as;
+
+  // [concept.derived], concept derived_from
+  using std::derived_from;
+
+  // [concept.convertible], concept convertible_to
+  using std::convertible_to;
+
+  // [concept.commonref], concept common_reference_with
+  using std::common_reference_with;
+
+  // [concept.common], concept common_with
+  using std::common_with;
+
+  // [concepts.arithmetic], arithmetic concepts
+  using std::floating_point;
+  using std::integral;
+  using std::signed_integral;
+  using std::unsigned_integral;
+
+  // [concept.assignable], concept assignable_from
+  using std::assignable_from;
+
+  // [concept.swappable], concept swappable
+  namespace ranges {
+    inline namespace __cpo {
+      using std::ranges::__cpo::swap;
+    }
+  } // namespace ranges
+
+  using std::swappable;
+  using std::swappable_with;
+
+  // [concept.destructible], concept destructible
+  using std::destructible;
+
+  // [concept.constructible], concept constructible_from
+  using std::constructible_from;
+
+  // [concept.default.init], concept default_initializable
+  using std::default_initializable;
+
+  // [concept.moveconstructible], concept move_constructible
+  using std::move_constructible;
+
+  // [concept.copyconstructible], concept copy_constructible
+  using std::copy_constructible;
+
+  // [concepts.compare], comparison concepts
+  // [concept.equalitycomparable], concept equality_comparable
+  using std::equality_comparable;
+  using std::equality_comparable_with;
+
+  // [concept.totallyordered], concept totally_ordered
+  using std::totally_ordered;
+  using std::totally_ordered_with;
+
+  // [concepts.object], object concepts
+  using std::copyable;
+  using std::movable;
+  using std::regular;
+  using std::semiregular;
+
+  // [concepts.callable], callable concepts
+  // [concept.invocable], concept invocable
+  using std::invocable;
+
+  // [concept.regularinvocable], concept regular_invocable
+  using std::regular_invocable;
+
+  // [concept.predicate], concept predicate
+  using std::predicate;
+
+  // [concept.relation], concept relation
+  using std::relation;
+
+  // [concept.equiv], concept equivalence_relation
+  using std::equivalence_relation;
+
+  // [concept.strictweakorder], concept strict_weak_order
+  using std::strict_weak_order;
+
+} // namespace std

libcxx/modules/std/condition_variable.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <condition_variable>
+
+export module std:condition_variable;
+export namespace std {
+
+  // [thread.condition.condvar], class condition_variable
+  using std::condition_variable;
+  // [thread.condition.condvarany], class condition_variable_any
+  using std::condition_variable_any;
+
+  // [thread.condition.nonmember], non-member functions
+  using std::notify_all_at_thread_exit;
+
+  using std::cv_status;
+
+} // namespace std

libcxx/modules/std/coroutine.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <coroutine>
+#include <functional>
+export module std:coroutine;
+export namespace std {
+
+  // [coroutine.traits], coroutine traits
+  using std::coroutine_traits;
+
+  // [coroutine.handle], coroutine handle
+  using std::coroutine_handle;
+
+  // [coroutine.handle.compare], comparison operators
+  using std::operator==;
+  using std::operator<=>;
+
+  // [coroutine.handle.hash], hash support
+  using std::hash;
+
+  // [coroutine.noop], no-op coroutines
+  using std::noop_coroutine;
+  using std::noop_coroutine_handle;
+  using std::noop_coroutine_promise;
+
+  // [coroutine.trivial.awaitables], trivial awaitables
+  using std::suspend_always;
+  using std::suspend_never;
+} // namespace std

libcxx/modules/std/csetjmp.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <csetjmp>
+
+export module std:csetjmp;
+export namespace std {
+  using std::jmp_buf;
+  using std::longjmp;
+} // namespace std

libcxx/modules/std/csignal.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <csignal>
+
+export module std:csignal;
+export namespace std {
+  using std::sig_atomic_t;
+
+  // [support.signal], signal handlers
+  using std::signal;
+
+  using std::raise;
+
+} // namespace std

libcxx/modules/std/cstdarg.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cstdarg>
+
+export module std:cstdarg;
+export namespace std {
+  using std::va_list;
+} // namespace std

libcxx/modules/std/cstddef.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cstddef>
+
+export module std:cstddef;
+export namespace std {
+  using std::max_align_t;
+  using std::nullptr_t;
+  using std::ptrdiff_t;
+  using std::size_t;
+
+  using std::byte;
+
+  // [support.types.byteops], byte type operations
+  using std::operator<<=;
+  using std::operator<<;
+  using std::operator>>=;
+  using std::operator>>;
+  using std::operator|=;
+  using std::operator|;
+  using std::operator&=;
+  using std::operator&;
+  using std::operator^=;
+  using std::operator^;
+  using std::operator~;
+  using std::to_integer;
+} // namespace std

libcxx/modules/std/cstdint.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cstdint>
+
+export module std:cstdint;
+export namespace std {
+  // signed
+  using std::int8_t _LIBCPP_USING_IF_EXISTS;
+  using std::int16_t _LIBCPP_USING_IF_EXISTS;
+  using std::int32_t _LIBCPP_USING_IF_EXISTS;
+  using std::int64_t _LIBCPP_USING_IF_EXISTS;
+
+  using std::int_fast16_t;
+  using std::int_fast32_t;
+  using std::int_fast64_t;
+  using std::int_fast8_t;
+
+  using std::int_least16_t;
+  using std::int_least32_t;
+  using std::int_least64_t;
+  using std::int_least8_t;
+
+  using std::intmax_t;
+
+  using std::intptr_t _LIBCPP_USING_IF_EXISTS;
+
+  // unsigned
+  using std::uint8_t _LIBCPP_USING_IF_EXISTS;
+  using std::uint16_t _LIBCPP_USING_IF_EXISTS;
+  using std::uint32_t _LIBCPP_USING_IF_EXISTS;
+  using std::uint64_t _LIBCPP_USING_IF_EXISTS;
+
+  using std::uint_fast16_t;
+  using std::uint_fast32_t;
+  using std::uint_fast64_t;
+  using std::uint_fast8_t;
+
+  using std::uint_least16_t;
+  using std::uint_least32_t;
+  using std::uint_least64_t;
+  using std::uint_least8_t;
+
+  using std::uintmax_t;
+
+  using std::uintptr_t _LIBCPP_USING_IF_EXISTS;
+} // namespace std

libcxx/modules/std/cstdio.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cstdio>
+
+export module std:cstdio;
+export namespace std {
+  using std::FILE;
+  using std::fpos_t;
+  using std::size_t;
+
+  using std::clearerr;
+  using std::fclose;
+  using std::feof;
+  using std::ferror;
+  using std::fflush;
+  using std::fgetc;
+  using std::fgetpos;
+  using std::fgets;
+  using std::fopen;
+  using std::fprintf;
+  using std::fputc;
+  using std::fputs;
+  using std::fread;
+  using std::freopen;
+  using std::fscanf;
+  using std::fseek;
+  using std::fsetpos;
+  using std::ftell;
+  using std::fwrite;
+  using std::getc;
+  using std::getchar;
+  using std::perror;
+  using std::printf;
+  using std::putc;
+  using std::putchar;
+  using std::puts;
+  using std::remove;
+  using std::rename;
+  using std::rewind;
+  using std::scanf;
+  using std::setbuf;
+  using std::setvbuf;
+  using std::snprintf;
+  using std::sprintf;
+  using std::sscanf;
+  using std::tmpfile;
+  using std::tmpnam;
+  using std::ungetc;
+  using std::vfprintf;
+  using std::vfscanf;
+  using std::vprintf;
+  using std::vscanf;
+  using std::vsnprintf;
+  using std::vsprintf;
+  using std::vsscanf;
+} // namespace std

libcxx/modules/std/cstdlib.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cstdlib>
+
+export module std:cstdlib;
+export namespace std {
+  using std::div_t;
+  using std::ldiv_t;
+  using std::lldiv_t;
+  using std::size_t;
+
+  // [support.start.term], start and termination
+  using std::_Exit;
+  using std::abort;
+  using std::at_quick_exit;
+  using std::atexit;
+  using std::exit;
+  using std::quick_exit;
+
+  using std::getenv;
+  using std::system;
+
+  // [c.malloc], C library memory allocation
+  using std::aligned_alloc;
+  using std::calloc;
+  using std::free;
+  using std::malloc;
+  using std::realloc;
+
+  using std::atof;
+  using std::atoi;
+  using std::atol;
+  using std::atoll;
+  using std::strtod;
+  using std::strtof;
+  using std::strtol;
+  using std::strtold;
+  using std::strtoll;
+  using std::strtoul;
+  using std::strtoull;
+
+  // [c.mb.wcs], multibyte / wide string and character conversion functions
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::mblen;
+  using std::mbstowcs;
+  using std::mbtowc;
+  using std::wcstombs;
+  using std::wctomb;
+#endif
+  // [alg.c.library], C standard library algorithms
+  using std::bsearch;
+  using std::qsort;
+
+  // [c.math.rand], low-quality random number generation
+  using std::rand;
+  using std::srand;
+
+  // [c.math.abs], absolute values
+  using std::abs;
+
+  using std::labs;
+  using std::llabs;
+
+  using std::div;
+  using std::ldiv;
+  using std::lldiv;
+} // namespace std

libcxx/modules/std/cstring.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cstring>
+
+export module std:cstring;
+export namespace std {
+  using std::size_t;
+
+  using std::memchr;
+  using std::memcmp;
+  using std::memcpy;
+  using std::memmove;
+  using std::memset;
+  using std::strcat;
+  using std::strchr;
+  using std::strcmp;
+  using std::strcoll;
+  using std::strcpy;
+  using std::strcspn;
+  using std::strerror;
+  using std::strlen;
+  using std::strncat;
+  using std::strncmp;
+  using std::strncpy;
+  using std::strpbrk;
+  using std::strrchr;
+  using std::strspn;
+  using std::strstr;
+  using std::strtok;
+  using std::strxfrm;
+} // namespace std

libcxx/modules/std/ctime.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <ctime>
+
+export module std:ctime;
+export namespace std {
+  using std::clock_t;
+  using std::size_t;
+  using std::time_t;
+
+  using std::timespec;
+  using std::tm;
+
+  using std::asctime;
+  using std::clock;
+  using std::ctime;
+  using std::difftime;
+  using std::gmtime;
+  using std::localtime;
+  using std::mktime;
+  using std::strftime;
+  using std::time;
+  using std::timespec_get;
+} // namespace std

libcxx/modules/std/cuchar.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <cuchar>
+
+export module std:cuchar;
+export namespace std {
+  // Note the Standard does not mark these symbols optional, but libc++'s header
+  // does. So this seems strictly not to be conforming.
+
+  // mbstate_t is conditionally here, but always present in cwchar.cppm. To avoid
+  // conflicing declarations omit the using here.
+
+  // size_t is conditionally here, but always present in cstddef.cppm. To avoid
+  // conflicing declarations omit the using here.
+
+#  if !defined(_LIBCPP_HAS_NO_C8RTOMB_MBRTOC8)
+  using std::mbrtoc8 _LIBCPP_USING_IF_EXISTS;
+  using std::c8rtomb _LIBCPP_USING_IF_EXISTS;
+#endif
+  using std::mbrtoc16 _LIBCPP_USING_IF_EXISTS;
+  using std::c16rtomb _LIBCPP_USING_IF_EXISTS;
+  using std::mbrtoc32 _LIBCPP_USING_IF_EXISTS;
+  using std::c32rtomb _LIBCPP_USING_IF_EXISTS;
+} // namespace std

libcxx/modules/std/cwchar.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+#  include <cwchar>
+#endif
+
+export module std:cwchar;
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+export namespace std {
+  using std::mbstate_t;
+  using std::size_t;
+  using std::wint_t;
+
+  using std::tm;
+
+  using std::btowc;
+  using std::fgetwc;
+  using std::fgetws;
+  using std::fputwc;
+  using std::fputws;
+  using std::fwide;
+  using std::fwprintf;
+  using std::fwscanf;
+  using std::getwc;
+  using std::getwchar;
+  using std::putwc;
+  using std::putwchar;
+  using std::swprintf;
+  using std::swscanf;
+  using std::ungetwc;
+  using std::vfwprintf;
+  using std::vfwscanf;
+  using std::vswprintf;
+  using std::vswscanf;
+  using std::vwprintf;
+  using std::vwscanf;
+  using std::wcscat;
+  using std::wcschr;
+  using std::wcscmp;
+  using std::wcscoll;
+  using std::wcscpy;
+  using std::wcscspn;
+  using std::wcsftime;
+  using std::wcslen;
+  using std::wcsncat;
+  using std::wcsncmp;
+  using std::wcsncpy;
+  using std::wcspbrk;
+  using std::wcsrchr;
+  using std::wcsspn;
+  using std::wcsstr;
+  using std::wcstod;
+  using std::wcstof;
+  using std::wcstok;
+  using std::wcstol;
+  using std::wcstold;
+  using std::wcstoll;
+  using std::wcstoul;
+  using std::wcstoull;
+  using std::wcsxfrm;
+  using std::wctob;
+  using std::wmemchr;
+  using std::wmemcmp;
+  using std::wmemcpy;
+  using std::wmemmove;
+  using std::wmemset;
+  using std::wprintf;
+  using std::wscanf;
+
+  // [c.mb.wcs], multibyte / wide string and character conversion functions
+  using std::mbrlen;
+  using std::mbrtowc;
+  using std::mbsinit;
+  using std::mbsrtowcs;
+  using std::wcrtomb;
+  using std::wcsrtombs;
+
+} // namespace std
+#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS

libcxx/modules/std/cwctype.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+#  include <cwctype>
+#endif
+
+export module std:cwctype;
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+export namespace std {
+  using std::wctrans_t;
+  using std::wctype_t;
+  using std::wint_t;
+
+  using std::iswalnum;
+  using std::iswalpha;
+  using std::iswblank;
+  using std::iswcntrl;
+  using std::iswctype;
+  using std::iswdigit;
+  using std::iswgraph;
+  using std::iswlower;
+  using std::iswprint;
+  using std::iswpunct;
+  using std::iswspace;
+  using std::iswupper;
+  using std::iswxdigit;
+  using std::towctrans;
+  using std::towlower;
+  using std::towupper;
+  using std::wctrans;
+  using std::wctype;
+} // namespace std
+#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS

libcxx/modules/std/deque.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <deque>
+
+export module std:deque;
+export namespace std {
+  // [deque], class template deque
+  using std::deque;
+
+  using std::operator==;
+  using std::operator<=>;
+
+  using std::swap;
+
+  // [deque.erasure], erasure
+  using std::erase;
+  using std::erase_if;
+
+  namespace pmr {
+    using std::pmr::deque;
+  }
+} // namespace std

libcxx/modules/std/exception.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <exception>
+export module std:exception;
+export namespace std {
+  using std::bad_exception;
+  using std::current_exception;
+  using std::exception;
+  using std::exception_ptr;
+  using std::get_terminate;
+  using std::make_exception_ptr;
+  using std::nested_exception;
+  using std::rethrow_exception;
+  using std::rethrow_if_nested;
+  using std::set_terminate;
+  using std::terminate;
+  using std::terminate_handler;
+  using std::throw_with_nested;
+  using std::uncaught_exception;
+  using std::uncaught_exceptions;
+} // namespace std

libcxx/modules/std/execution.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <execution>
+
+export module std:execution;
+export namespace std {
+  // [execpol.type], execution policy type trait
+  using std::is_execution_policy;
+  using std::is_execution_policy_v;
+} // namespace std
+
+namespace std::execution {
+  // [execpol.seq], sequenced execution policy
+  using std::execution::sequenced_policy;
+
+  // [execpol.par], parallel execution policy
+  using std::execution::parallel_policy;
+
+  // [execpol.parunseq], parallel and unsequenced execution policy
+  using std::execution::parallel_unsequenced_policy;
+
+  // [execpol.unseq], unsequenced execution policy
+  using std::execution::unsequenced_policy;
+
+  // [execpol.objects], execution policy objects
+  using std::execution::par;
+  using std::execution::par_unseq;
+  using std::execution::seq;
+  using std::execution::unseq;
+} // namespace std::execution

libcxx/modules/std/expected.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <expected>
+
+export module std:expected;
+export namespace std {
+  // [expected.unexpected], class template unexpected
+  using std::unexpected;
+
+  // [expected.bad], class template bad_expected_access
+  using std::bad_expected_access;
+
+  // in-place construction of unexpected values
+  using std::unexpect;
+  using std::unexpect_t;
+
+  // [expected.expected], class template expected
+  using std::expected;
+} // namespace std

libcxx/modules/std/filesystem.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <filesystem>
+
+export module std:filesystem;
+export namespace std::filesystem {
+  // [fs.class.path], paths
+  using std::filesystem::path;
+
+  // [fs.path.nonmember], path non-member functions
+  using std::filesystem::hash_value;
+  using std::filesystem::swap;
+
+  // [fs.class.filesystem.error], filesystem errors
+  using std::filesystem::filesystem_error;
+
+  // [fs.class.directory.entry], directory entries
+  using std::filesystem::directory_entry;
+
+  // [fs.class.directory.iterator], directory iterators
+  using std::filesystem::directory_iterator;
+
+  // [fs.dir.itr.nonmembers], range access for directory iterators
+  using std::filesystem::begin;
+  using std::filesystem::end;
+
+  // [fs.class.rec.dir.itr], recursive directory iterators
+  using std::filesystem::recursive_directory_iterator;
+
+  // [fs.rec.dir.itr.nonmembers], range access for recursive directory iterators
+  using std::filesystem::begin;
+  using std::filesystem::end;
+
+  // [fs.class.file.status], file status
+  using std::filesystem::file_status;
+  using std::filesystem::space_info;
+
+  // [fs.enum], enumerations
+  using std::filesystem::copy_options;
+  using std::filesystem::directory_options;
+  using std::filesystem::file_type;
+  using std::filesystem::perm_options;
+  using std::filesystem::perms;
+
+  using std::filesystem::file_time_type;
+
+  // several of these enums are a bitmask type.
+  // [bitmask.types] specified operators
+  using std::filesystem::operator&;
+  using std::filesystem::operator&=;
+  using std::filesystem::operator^;
+  using std::filesystem::operator^=;
+  using std::filesystem::operator|;
+  using std::filesystem::operator|=;
+  using std::filesystem::operator~;
+
+  // [fs.op.funcs], filesystem operations
+  using std::filesystem::absolute;
+  using std::filesystem::canonical;
+  using std::filesystem::copy;
+  using std::filesystem::copy_file;
+  using std::filesystem::copy_symlink;
+  using std::filesystem::create_directories;
+  using std::filesystem::create_directory;
+  using std::filesystem::create_directory_symlink;
+  using std::filesystem::create_hard_link;
+  using std::filesystem::create_symlink;
+  using std::filesystem::current_path;
+  using std::filesystem::equivalent;
+  using std::filesystem::exists;
+  using std::filesystem::file_size;
+  using std::filesystem::hard_link_count;
+
+  using std::filesystem::is_block_file;
+  using std::filesystem::is_character_file;
+  using std::filesystem::is_directory;
+  using std::filesystem::is_empty;
+  using std::filesystem::is_fifo;
+  using std::filesystem::is_other;
+  using std::filesystem::is_regular_file;
+  using std::filesystem::is_socket;
+  using std::filesystem::is_symlink;
+
+  using std::filesystem::last_write_time;
+  using std::filesystem::permissions;
+  using std::filesystem::proximate;
+  using std::filesystem::read_symlink;
+  using std::filesystem::relative;
+  using std::filesystem::remove;
+
+  using std::filesystem::remove_all;
+  using std::filesystem::rename;
+  using std::filesystem::resize_file;
+  using std::filesystem::space;
+  using std::filesystem::status;
+  using std::filesystem::status_known;
+  using std::filesystem::symlink_status;
+  using std::filesystem::temp_directory_path;
+  using std::filesystem::weakly_canonical;
+
+  // [depr.fs.path.factory]
+  using std::filesystem::u8path;
+
+} // namespace std::filesystem
+
+// [fs.path.hash], hash support
+namespace std {
+  using std::hash;
+}
+
+namespace std::ranges {
+  using std::ranges::enable_borrowed_range;
+  using std::ranges::enable_view;
+} // namespace std::ranges

libcxx/modules/std/flat_map.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<flat_map>)
+#  error "include this header unconditionally and uncomment the exported symbols"
+#  include <flat_map>
+#endif
+
+export module std:flat_map;
+export namespace std {
+#if 0
+  // [flat.map], class template flat_­map
+  using std::flat_map;
+
+  using std::sorted_unique;
+  using std::sorted_unique_t;
+
+  using std::uses_allocator;
+
+  // [flat.map.erasure], erasure for flat_­map
+  using std::erase_if;
+
+  // [flat.multimap], class template flat_­multimap
+  using std::flat_multimap;
+
+  using std::sorted_equivalent;
+  using std::sorted_equivalent_t;
+
+  // [flat.multimap.erasure], erasure for flat_­multimap
+#endif
+} // namespace std

libcxx/modules/std/flat_set.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<flat_set>)
+#  error "include this header unconditionally and uncomment the exported symbols"
+#  include <flat_set>
+#endif
+
+export module std:flat_set;
+export namespace std {
+#if 0
+  // [flat.set], class template flat_­set
+  using std::flat_set;
+
+  using std::sorted_unique;
+  using std::sorted_unique_t;
+
+  using std::uses_allocator;
+
+  // [flat.set.erasure], erasure for flat_­set
+  using std::erase_if;
+
+  // [flat.multiset], class template flat_­multiset
+  using std::flat_multiset;
+
+  using std::sorted_equivalent;
+  using std::sorted_equivalent_t;
+#endif
+} // namespace std

libcxx/modules/std/format.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <format>
+
+export module std:format;
+#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
+export namespace std {
+  // [format.context], class template basic_format_context
+  using std::basic_format_context;
+  using std::format_context;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wformat_context;
+#  endif
+
+  // [format.args], class template basic_format_args
+  using std::basic_format_args;
+  using std::format_args;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wformat_args;
+#  endif
+
+  // [format.fmt.string], class template basic_format_string
+  using std::basic_format_string;
+  using std::format_string;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wformat_string;
+#  endif
+
+  // [format.functions], formatting functions
+  using std::format;
+  using std::format_to;
+  using std::vformat;
+  using std::vformat_to;
+
+  using std::format_to_n;
+  using std::format_to_n_result;
+  using std::formatted_size;
+
+  // [format.formatter], formatter
+  using std::formatter;
+
+  // [format.formattable], concept formattable
+  using std::formattable;
+
+  // [format.parse.ctx], class template basic_format_parse_context
+  using std::basic_format_parse_context;
+  using std::format_parse_context;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wformat_parse_context;
+#  endif
+
+  // [format.range], formatting of ranges
+  // [format.range.fmtkind], variable template format_kind
+  using std::format_kind;
+  using std::range_format;
+
+  // [format.range.formatter], class template range_formatter
+  using std::range_formatter;
+
+  // [format.arg], class template basic_format_arg
+  using std::basic_format_arg;
+  using std::visit_format_arg;
+
+  // [format.arg.store], class template format-arg-store
+  using std::make_format_args;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::make_wformat_args;
+#  endif
+
+  // [format.error], class format_error
+  using std::format_error;
+} // namespace std
+#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)

libcxx/modules/std/forward_list.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <forward_list>
+
+export module std:forward_list;
+export namespace std {
+  // [forward.list], class template forward_list
+  using std::forward_list;
+
+  using std::operator==;
+  using std::operator<=>;
+
+  using std::swap;
+
+  // [forward.list.erasure], erasure
+  using std::erase;
+  using std::erase_if;
+
+  namespace pmr {
+    using std::pmr::forward_list;
+  }
+} // namespace std

libcxx/modules/std/fstream.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <fstream>
+#endif
+
+export module std:fstream;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::basic_filebuf;
+
+  using std::swap;
+
+  using std::filebuf;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wfilebuf;
+#  endif
+
+  using std::basic_ifstream;
+
+  using std::ifstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wifstream;
+#  endif
+
+  using std::basic_ofstream;
+
+  using std::ofstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wofstream;
+#  endif
+
+  using std::basic_fstream;
+
+  using std::fstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wfstream;
+#  endif
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/functional.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <functional>
+
+export module std:functional;
+export namespace std {
+  // [func.invoke], invoke
+  using std::invoke;
+  using std::invoke_r;
+
+  // [refwrap], reference_wrapper
+  using std::reference_wrapper;
+
+  using std::cref;
+  using std::ref;
+
+  // [arithmetic.operations], arithmetic operations
+  using std::divides;
+  using std::minus;
+  using std::modulus;
+  using std::multiplies;
+  using std::negate;
+  using std::plus;
+  // [comparisons], comparisons
+  using std::equal_to;
+  using std::greater;
+  using std::greater_equal;
+  using std::less;
+  using std::less_equal;
+  using std::not_equal_to;
+
+  // [comparisons.three.way], class compare_three_way
+  using std::compare_three_way;
+
+  // [logical.operations], logical operations
+  using std::logical_and;
+  using std::logical_not;
+  using std::logical_or;
+
+  // [bitwise.operations], bitwise operations
+  using std::bit_and;
+  using std::bit_not;
+  using std::bit_or;
+  using std::bit_xor;
+
+  // [func.identity], identity
+  using std::identity;
+
+  // [func.not.fn], function template not_fn
+  using std::not_fn;
+
+  // [func.bind.partial], function templates bind_front and bind_back
+  // using std::bind_back;
+  using std::bind_front;
+
+  // [func.bind], bind
+  using std::is_bind_expression;
+  using std::is_bind_expression_v;
+  using std::is_placeholder;
+  using std::is_placeholder_v;
+
+  using std::bind;
+
+  namespace placeholders {
+    // M is the implementation-defined number of placeholders
+    using std::placeholders::_1;
+    using std::placeholders::_10;
+    using std::placeholders::_2;
+    using std::placeholders::_3;
+    using std::placeholders::_4;
+    using std::placeholders::_5;
+    using std::placeholders::_6;
+    using std::placeholders::_7;
+    using std::placeholders::_8;
+    using std::placeholders::_9;
+  } // namespace placeholders
+
+  // [func.memfn], member function adaptors
+  using std::mem_fn;
+
+  // [func.wrap], polymorphic function wrappers
+  using std::bad_function_call;
+
+  using std::function;
+
+  using std::swap;
+
+  using std::operator==;
+#if 1 // P1614
+  using std::operator!=;
+#endif
+
+  // [func.wrap.move], move only wrapper
+  // using std::move_only_function;
+
+  // [func.search], searchers
+  using std::default_searcher;
+
+  using std::boyer_moore_searcher;
+
+  using std::boyer_moore_horspool_searcher;
+
+  // [unord.hash], class template hash
+  using std::hash;
+
+  namespace ranges {
+    // [range.cmp], concept-constrained comparisons
+    using std::ranges::equal_to;
+    using std::ranges::greater;
+    using std::ranges::greater_equal;
+    using std::ranges::less;
+    using std::ranges::less_equal;
+    using std::ranges::not_equal_to;
+  } // namespace ranges
+} // namespace std

libcxx/modules/std/future.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <future>
+
+export module std:future;
+export namespace std {
+  using std::future_errc;
+  using std::future_status;
+  using std::launch;
+
+  // launch is a bitmask type.
+  // [bitmask.types] specified operators
+  using std::operator&;
+  using std::operator&=;
+  using std::operator^;
+  using std::operator^=;
+  using std::operator|;
+  using std::operator|=;
+  using std::operator~;
+
+  // [futures.errors], error handling
+  using std::is_error_code_enum;
+  using std::make_error_code;
+  using std::make_error_condition;
+
+  using std::future_category;
+
+  // [futures.future.error], class future_error
+  using std::future_error;
+
+  // [futures.promise], class template promise
+  using std::promise;
+
+  using std::swap;
+
+  using std::uses_allocator;
+
+  // [futures.unique.future], class template future
+  using std::future;
+
+  // [futures.shared.future], class template shared_future
+  using std::shared_future;
+
+  // [futures.task], class template packaged_task
+  using std::packaged_task;
+
+  // [futures.async], function template async
+  using std::async;
+} // namespace std

libcxx/modules/std/generator.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<generator>)
+#  error "include this header unconditionally and uncomment the exported symbols"
+#  include <generator>
+#endif
+
+export module std:generator;
+export namespace std {
+#if 0
+  using std::generator;
+#endif
+} // namespace std

libcxx/modules/std/initializer_list.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <initializer_list>
+
+export module std:initializer_list;
+export namespace std {
+  using std::initializer_list;
+
+  // [support.initlist.range], initializer list range access
+  using std::begin;
+  using std::end;
+} // namespace std

libcxx/modules/std/iomanip.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <iomanip>
+#endif
+
+export module std:iomanip;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::get_money;
+  using std::get_time;
+  using std::put_money;
+  using std::put_time;
+  using std::resetiosflags;
+  using std::setbase;
+  using std::setfill;
+  using std::setiosflags;
+  using std::setprecision;
+  using std::setw;
+
+  using std::quoted;
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/ios.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <ios>
+#endif
+
+export module std:ios;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::fpos;
+  // based on [tab:fpos.operations]
+  using std::operator!=; // Note not affected by P1614, seems like a bug.
+  using std::operator-;
+  using std::operator==;
+
+  using std::streamoff;
+  using std::streamsize;
+
+  using std::basic_ios;
+  using std::ios_base;
+
+  // [std.ios.manip], manipulators
+  using std::boolalpha;
+  using std::noboolalpha;
+
+  using std::noshowbase;
+  using std::showbase;
+
+  using std::noshowpoint;
+  using std::showpoint;
+
+  using std::noshowpos;
+  using std::showpos;
+
+  using std::noskipws;
+  using std::skipws;
+
+  using std::nouppercase;
+  using std::uppercase;
+
+  using std::nounitbuf;
+  using std::unitbuf;
+
+  // [adjustfield.manip], adjustfield
+  using std::internal;
+  using std::left;
+  using std::right;
+
+  // [basefield.manip], basefield
+  using std::dec;
+  using std::hex;
+  using std::oct;
+
+  // [floatfield.manip], floatfield
+  using std::defaultfloat;
+  using std::fixed;
+  using std::hexfloat;
+  using std::scientific;
+
+  // [error.reporting], error reporting
+  using std::io_errc;
+
+  using std::iostream_category;
+  using std::is_error_code_enum;
+  using std::make_error_code;
+  using std::make_error_condition;
+
+  // [iosfwd.syn]
+  using std::ios;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wios;
+#  endif
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/iosfwd.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <iosfwd>
+
+export module std:iosfwd;
+export namespace std {
+  // All symbols are exported by other modules.
+} // namespace std

libcxx/modules/std/iostream.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <iostream>
+#endif
+
+export module std:iostream;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::cerr;
+  using std::cin;
+  using std::clog;
+  using std::cout;
+
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wcerr;
+  using std::wcin;
+  using std::wclog;
+  using std::wcout;
+#  endif
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/istream.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <istream>
+#endif
+
+export module std:istream;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::basic_istream;
+
+  using std::istream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wistream;
+#  endif
+
+  using std::basic_iostream;
+
+  using std::iostream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wiostream;
+#  endif
+
+  using std::ws;
+
+  using std::operator>>;
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/iterator.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <iterator>
+
+export module std:iterator;
+export namespace std {
+  // [iterator.assoc.types], associated types
+  // [incrementable.traits], incrementable traits
+  using std::incrementable_traits;
+  using std::iter_difference_t;
+
+  using std::indirectly_readable_traits;
+  using std::iter_value_t;
+
+  // [iterator.traits], iterator traits
+  using std::iterator_traits;
+
+  using std::iter_reference_t;
+
+  namespace ranges {
+    // [iterator.cust], customization point objects
+    inline namespace __cpo {
+      // [iterator.cust.move], ranges::iter_move
+      using std::ranges::__cpo::iter_move;
+
+      // [iterator.cust.swap], ranges::iter_swap
+      using std::ranges::__cpo::iter_swap;
+    } // namespace __cpo
+  }   // namespace ranges
+
+  using std::iter_rvalue_reference_t;
+
+  // [iterator.concepts], iterator concepts
+  // [iterator.concept.readable], concept indirectly_readable
+  using std::indirectly_readable;
+
+  using std::iter_common_reference_t;
+
+  // [iterator.concept.writable], concept indirectly_writable
+  using std::indirectly_writable;
+
+  // [iterator.concept.winc], concept weakly_incrementable
+  using std::weakly_incrementable;
+
+  // [iterator.concept.inc], concept incrementable
+  using std::incrementable;
+
+  // [iterator.concept.iterator], concept input_or_output_iterator
+  using std::input_or_output_iterator;
+
+  // [iterator.concept.sentinel], concept sentinel_for
+  using std::sentinel_for;
+
+  // [iterator.concept.sizedsentinel], concept sized_sentinel_for
+  using std::disable_sized_sentinel_for;
+
+  using std::sized_sentinel_for;
+
+  // [iterator.concept.input], concept input_iterator
+  using std::input_iterator;
+
+  // [iterator.concept.output], concept output_iterator
+  using std::output_iterator;
+
+  // [iterator.concept.forward], concept forward_iterator
+  using std::forward_iterator;
+
+  // [iterator.concept.bidir], concept bidirectional_iterator
+  using std::bidirectional_iterator;
+
+  // [iterator.concept.random.access], concept random_access_iterator
+  using std::random_access_iterator;
+
+  // [iterator.concept.contiguous], concept contiguous_iterator
+  using std::contiguous_iterator;
+
+  // [indirectcallable], indirect callable requirements
+  // [indirectcallable.indirectinvocable], indirect callables
+  using std::indirectly_unary_invocable;
+
+  using std::indirectly_regular_unary_invocable;
+
+  using std::indirect_unary_predicate;
+
+  using std::indirect_binary_predicate;
+
+  using std::indirect_equivalence_relation;
+
+  using std::indirect_strict_weak_order;
+
+  using std::indirect_result_t;
+
+  // [projected], projected
+  using std::projected;
+
+  using std::incrementable_traits;
+
+  // [alg.req], common algorithm requirements
+  // [alg.req.ind.move], concept indirectly_movable
+  using std::indirectly_movable;
+
+  using std::indirectly_movable_storable;
+
+  // [alg.req.ind.copy], concept indirectly_copyable
+  using std::indirectly_copyable;
+
+  using std::indirectly_copyable_storable;
+
+  // [alg.req.ind.swap], concept indirectly_swappable
+  using std::indirectly_swappable;
+
+  // [alg.req.ind.cmp], concept indirectly_comparable
+  using std::indirectly_comparable;
+
+  // [alg.req.permutable], concept permutable
+  using std::permutable;
+
+  // [alg.req.mergeable], concept mergeable
+  using std::mergeable;
+
+  // [alg.req.sortable], concept sortable
+  using std::sortable;
+
+  // [iterator.primitives], primitives
+  // [std.iterator.tags], iterator tags
+  using std::bidirectional_iterator_tag;
+  using std::contiguous_iterator_tag;
+  using std::forward_iterator_tag;
+  using std::input_iterator_tag;
+  using std::output_iterator_tag;
+  using std::random_access_iterator_tag;
+
+  // [iterator.operations], iterator operations
+  using std::advance;
+  using std::distance;
+  using std::next;
+  using std::prev;
+
+  // [range.iter.ops], range iterator operations
+  namespace ranges {
+    // [range.iter.op.advance], ranges!::!advance
+    using std::ranges::advance;
+
+    // [range.iter.op.distance], ranges!::!distance
+    using std::ranges::distance;
+
+    // [range.iter.op.next], ranges!::!next
+    using std::ranges::next;
+
+    // [range.iter.op.prev], ranges!::!prev
+    using std::ranges::prev;
+  } // namespace ranges
+
+  // [predef.iterators], predefined iterators and sentinels
+  // [reverse.iterators], reverse iterators
+  using std::reverse_iterator;
+
+  using std::operator==;
+  using std::operator!=;
+  using std::operator<;
+  using std::operator>;
+  using std::operator<=;
+  using std::operator>=;
+  using std::operator<=>;
+
+  using std::operator-;
+  using std::operator+;
+
+  using std::make_reverse_iterator;
+
+  // using std::disable_sized_sentinel_for;
+
+  // [insert.iterators], insert iterators
+  using std::back_insert_iterator;
+  using std::back_inserter;
+
+  using std::front_insert_iterator;
+  using std::front_inserter;
+
+  using std::insert_iterator;
+  using std::inserter;
+
+  // [const.iterators], constant iterators and sentinels
+  // [const.iterators.alias], alias templates
+  //  using std::const_iterator;
+  //  using std::const_sentinel;
+  //  using std::iter_const_reference_t;
+
+  // [const.iterators.iterator], class template basic_const_iterator
+  //  using std::basic_const_iterator;
+
+  // using std::common_type;
+
+  //  using std::make_const_iterator;
+
+  // [move.iterators], move iterators and sentinels
+  using std::move_iterator;
+
+  using std::make_move_iterator;
+
+  using std::move_sentinel;
+
+  using std::common_iterator;
+
+  using std::incrementable_traits;
+
+  // [default.sentinel], default sentinel
+  using std::default_sentinel;
+  using std::default_sentinel_t;
+
+  // [iterators.counted], counted iterators
+  using std::counted_iterator;
+
+  // [unreachable.sentinel], unreachable sentinel
+  using std::unreachable_sentinel;
+  using std::unreachable_sentinel_t;
+
+  // [stream.iterators], stream iterators
+  using std::istream_iterator;
+
+  using std::ostream_iterator;
+
+  using std::istreambuf_iterator;
+  using std::ostreambuf_iterator;
+
+  // [iterator.range], range access
+  using std::begin;
+  using std::cbegin;
+  using std::cend;
+  using std::crbegin;
+  using std::crend;
+  using std::end;
+  using std::rbegin;
+  using std::rend;
+
+  using std::empty;
+  using std::size;
+  using std::ssize;
+
+  using std::data;
+
+  // [depr.iterator]
+  using std::iterator;
+} // namespace std

libcxx/modules/std/latch.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <latch>
+
+export module std:latch;
+export namespace std {
+  using std::latch;
+} // namespace std

libcxx/modules/std/limits.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <limits>
+
+export module std:limits;
+export namespace std {
+  // [fp.style], floating-point type properties
+  using std::float_denorm_style;
+  using std::float_round_style;
+
+  // [numeric.limits], class template numeric_­limits
+  using std::numeric_limits;
+} // namespace std

libcxx/modules/std/list.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <list>
+
+export module std:list;
+export namespace std {
+  // [list], class template list
+  using std::list;
+
+  using std::operator==;
+  using std::operator<=>;
+
+  using std::swap;
+
+  // [list.erasure], erasure
+  using std::erase;
+  using std::erase_if;
+
+  namespace pmr {
+    using std::pmr::list;
+  }
+} // namespace std

libcxx/modules/std/locale.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <locale>
+#endif
+
+export module std:locale;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  // [locale], locale
+  using std::has_facet;
+  using std::locale;
+  using std::use_facet;
+
+  // [locale.convenience], convenience interfaces
+  using std::isalnum;
+  using std::isalpha;
+  using std::isblank;
+  using std::iscntrl;
+  using std::isdigit;
+  using std::isgraph;
+  using std::islower;
+  using std::isprint;
+  using std::ispunct;
+  using std::isspace;
+  using std::isupper;
+  using std::isxdigit;
+  using std::tolower;
+  using std::toupper;
+
+  // [category.ctype], ctype
+  using std::codecvt;
+  using std::codecvt_base;
+  using std::codecvt_byname;
+  using std::ctype;
+  using std::ctype_base;
+  using std::ctype_byname;
+
+  // [category.numeric], numeric
+  using std::num_get;
+  using std::num_put;
+  using std::numpunct;
+  using std::numpunct_byname;
+
+  // [category.collate], collation
+  using std::collate;
+  using std::collate_byname;
+
+  // [category.time], date and time
+  using std::time_base;
+  using std::time_get;
+  using std::time_get_byname;
+  using std::time_put;
+  using std::time_put_byname;
+
+  // [category.monetary], money
+  using std::money_base;
+  using std::money_get;
+  using std::money_put;
+  using std::moneypunct;
+  using std::moneypunct_byname;
+
+  // [category.messages], message retrieval
+  using std::messages;
+  using std::messages_base;
+  using std::messages_byname;
+
+  // [depr.conversions.buffer]
+  using std::wbuffer_convert;
+
+  // [depr.conversions.string]
+  using std::wstring_convert;
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/map.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <map>
+
+export module std:map;
+export namespace std {
+  // [map], class template map
+  using std::map;
+
+  using std::operator==;
+  using std::operator<=>;
+
+  using std::swap;
+
+  // [map.erasure], erasure for map
+  using std::erase_if;
+
+  // [multimap], class template multimap
+  using std::multimap;
+
+  namespace pmr {
+    using std::pmr::map;
+    using std::pmr::multimap;
+  } // namespace pmr
+} // namespace std

libcxx/modules/std/mdspan.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <mdspan>
+
+export module std:mdspan;
+export namespace std {
+  // [mdspan.extents], class template extents
+  using std::extents;
+
+  // [mdspan.extents.dextents], alias template dextents
+  using std::dextents;
+
+#if 0
+  // [mdspan.layout], layout mapping
+  using std::layout_left;
+  using std::layout_right;
+  using std::layout_stride;
+
+  // [mdspan.accessor.default], class template default_­accessor
+  using std::default_accessor;
+
+  // [mdspan.mdspan], class template mdspan
+  using std::mdspan;
+#endif
+} // namespace std

libcxx/modules/std/memory.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <memory>
+
+export module std:memory;
+export namespace std {
+  // [pointer.traits], pointer traits
+  using std::pointer_traits;
+
+  // [pointer.conversion], pointer conversion
+  using std::to_address;
+
+  // [ptr.align], pointer alignment
+  using std::align;
+  using std::assume_aligned;
+
+  // [obj.lifetime], explicit lifetime management
+  //  using std::start_lifetime_as;
+  //  using std::start_lifetime_as_array;
+
+  // [allocator.tag], allocator argument tag
+  using std::allocator_arg;
+  using std::allocator_arg_t;
+
+  // [allocator.uses], uses_allocator
+  using std::uses_allocator;
+
+  // [allocator.uses.trait], uses_allocator
+  using std::uses_allocator_v;
+
+  // [allocator.uses.construction], uses-allocator construction
+  using std::uses_allocator_construction_args;
+
+  using std::make_obj_using_allocator;
+  using std::uninitialized_construct_using_allocator;
+
+  // [allocator.traits], allocator traits
+  using std::allocator_traits;
+
+  using std::allocation_result;
+
+  using std::allocate_at_least;
+
+  // [default.allocator], the default allocator
+  using std::allocator;
+  using std::operator==;
+
+  // [specialized.addressof], addressof
+  using std::addressof;
+
+  // [specialized.algorithms], specialized algorithms
+  // [special.mem.concepts], special memory concepts
+
+  using std::uninitialized_default_construct;
+  using std::uninitialized_default_construct_n;
+
+  namespace ranges {
+    using std::ranges::uninitialized_default_construct;
+    using std::ranges::uninitialized_default_construct_n;
+  } // namespace ranges
+
+  using std::uninitialized_value_construct;
+  using std::uninitialized_value_construct_n;
+
+  namespace ranges {
+    using std::ranges::uninitialized_value_construct;
+    using std::ranges::uninitialized_value_construct_n;
+  } // namespace ranges
+
+  using std::uninitialized_copy;
+  using std::uninitialized_copy_n;
+
+  namespace ranges {
+    using std::ranges::uninitialized_copy;
+    using std::ranges::uninitialized_copy_result;
+
+    using std::ranges::uninitialized_copy_n;
+    using std::ranges::uninitialized_copy_n_result;
+  } // namespace ranges
+
+  using std::uninitialized_move;
+  using std::uninitialized_move_n;
+
+  namespace ranges {
+    using std::ranges::uninitialized_move;
+    using std::ranges::uninitialized_move_result;
+
+    using std::ranges::uninitialized_move_n;
+    using std::ranges::uninitialized_move_n_result;
+  } // namespace ranges
+
+  using std::uninitialized_fill;
+  using std::uninitialized_fill_n;
+
+  namespace ranges {
+    using std::ranges::uninitialized_fill;
+    using std::ranges::uninitialized_fill_n;
+  } // namespace ranges
+
+  // [specialized.construct], construct_at
+  using std::construct_at;
+
+  namespace ranges {
+    using std::ranges::construct_at;
+  }
+  // [specialized.destroy], destroy
+  using std::destroy;
+  using std::destroy_at;
+  using std::destroy_n;
+
+  namespace ranges {
+    using std::ranges::destroy;
+    using std::ranges::destroy_at;
+    using std::ranges::destroy_n;
+  } // namespace ranges
+
+  // [unique.ptr], class template unique_ptr
+  using std::default_delete;
+  using std::unique_ptr;
+
+  using std::make_unique;
+  using std::make_unique_for_overwrite;
+
+  using std::swap;
+
+  using std::operator!=;
+  using std::operator<;
+  using std::operator>;
+  using std::operator<=;
+  using std::operator>=;
+  using std::operator<=>;
+
+  using std::operator<<;
+
+  // [util.smartptr.weak.bad], class bad_weak_ptr
+  using std::bad_weak_ptr;
+
+  // [util.smartptr.shared], class template shared_ptr
+  using std::shared_ptr;
+
+  // [util.smartptr.shared.create], shared_ptr creation
+  using std::allocate_shared;
+  using std::allocate_shared_for_overwrite;
+  using std::make_shared;
+  using std::make_shared_for_overwrite;
+
+  // [util.smartptr.shared.spec], shared_ptr specialized algorithms
+  using std::swap;
+
+  // [util.smartptr.shared.cast], shared_ptr casts
+  using std::const_pointer_cast;
+  using std::dynamic_pointer_cast;
+  using std::reinterpret_pointer_cast;
+  using std::static_pointer_cast;
+
+  using std::get_deleter;
+
+  // [util.smartptr.shared.io], shared_ptr I/O
+
+  // [util.smartptr.weak], class template weak_ptr
+  using std::weak_ptr;
+
+  // [util.smartptr.weak.spec], weak_ptr specialized algorithms
+
+  // [util.smartptr.ownerless], class template owner_less
+  using std::owner_less;
+
+  // [util.smartptr.enab], class template enable_shared_from_this
+  using std::enable_shared_from_this;
+
+  // [util.smartptr.hash], hash support
+  using std::hash;
+
+  // [util.smartptr.atomic], atomic smart pointers
+  // using std::atomic;
+
+  // [out.ptr.t], class template out_ptr_t
+  //  using std::out_ptr_t;
+
+  // [out.ptr], function template out_ptr
+  //  using std::out_ptr;
+
+  // [inout.ptr.t], class template inout_ptr_t
+  //  using std::inout_ptr_t;
+
+  // [inout.ptr], function template inout_ptr
+  //  using std::inout_ptr;
+
+  // [depr.util.smartptr.shared.atomic]
+  using std::atomic_is_lock_free;
+
+  using std::atomic_load;
+  using std::atomic_load_explicit;
+
+  using std::atomic_store;
+  using std::atomic_store_explicit;
+
+  using std::atomic_exchange;
+  using std::atomic_exchange_explicit;
+
+  using std::atomic_compare_exchange_strong;
+  using std::atomic_compare_exchange_strong_explicit;
+  using std::atomic_compare_exchange_weak;
+  using std::atomic_compare_exchange_weak_explicit;
+} // namespace std

libcxx/modules/std/memory_resource.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <memory_resource>
+
+export module std:memory_resource;
+export namespace std::pmr {
+  // [mem.res.class], class memory_resource
+  using std::pmr::memory_resource;
+
+  using std::pmr::operator==;
+#if 1 // P1614
+  using std::operator!=;
+#endif
+
+  // [mem.poly.allocator.class], class template polymorphic_allocator
+  using std::pmr::polymorphic_allocator;
+
+  // [mem.res.global], global memory resources
+  using std::pmr::get_default_resource;
+  using std::pmr::new_delete_resource;
+  using std::pmr::null_memory_resource;
+  using std::pmr::set_default_resource;
+
+  // [mem.res.pool], pool resource classes
+  using std::pmr::monotonic_buffer_resource;
+  using std::pmr::pool_options;
+  using std::pmr::synchronized_pool_resource;
+  using std::pmr::unsynchronized_pool_resource;
+} // namespace std::pmr

libcxx/modules/std/mutex.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <mutex>
+
+export module std:mutex;
+export namespace std {
+  // [thread.mutex.class], class mutex
+  using std::mutex;
+  // [thread.mutex.recursive], class recursive_mutex
+  using std::recursive_mutex;
+  // [thread.timedmutex.class] class timed_mutex
+  using std::timed_mutex;
+  // [thread.timedmutex.recursive], class recursive_timed_mutex
+  using std::recursive_timed_mutex;
+
+  using std::adopt_lock_t;
+  using std::defer_lock_t;
+  using std::try_to_lock_t;
+
+  using std::adopt_lock;
+  using std::defer_lock;
+  using std::try_to_lock;
+
+  // [thread.lock], locks
+  using std::lock_guard;
+  using std::scoped_lock;
+  using std::unique_lock;
+
+  using std::swap;
+
+  // [thread.lock.algorithm], generic locking algorithms
+  using std::lock;
+  using std::try_lock;
+
+  using std::once_flag;
+
+  using std::call_once;
+} // namespace std

libcxx/modules/std/new.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <new>
+
+export module std:__new; // Note new is a keyword and not a valid identifier
+export namespace std {
+  // [alloc.errors], storage allocation errors
+  using std::bad_alloc;
+  using std::bad_array_new_length;
+
+  using std::destroying_delete;
+  using std::destroying_delete_t;
+
+  // global operator new control
+  using std::align_val_t;
+
+  using std::nothrow;
+  using std::nothrow_t;
+
+  using std::get_new_handler;
+  using std::new_handler;
+  using std::set_new_handler;
+
+  // [ptr.launder], pointer optimization barrier
+  using std::launder;
+#if 0
+  // [hardware.interference], hardware interference size
+  using std::hardware_constructive_interference_size;
+  using std::hardware_destructive_interference_size;
+#endif
+} // namespace std
+
+export {
+  using ::operator new;
+  using ::operator delete;
+  using ::operator new[];
+  using ::operator delete[];
+} // export

libcxx/modules/std/numbers.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <numbers>
+
+export module std:numbers;
+export namespace std::numbers {
+  using std::numbers::e_v;
+  using std::numbers::egamma_v;
+  using std::numbers::inv_pi_v;
+  using std::numbers::inv_sqrt3_v;
+  using std::numbers::inv_sqrtpi_v;
+  using std::numbers::ln10_v;
+  using std::numbers::ln2_v;
+  using std::numbers::log10e_v;
+  using std::numbers::log2e_v;
+  using std::numbers::phi_v;
+  using std::numbers::pi_v;
+  using std::numbers::sqrt2_v;
+  using std::numbers::sqrt3_v;
+
+  using std::numbers::e_v;
+  using std::numbers::egamma_v;
+  using std::numbers::inv_pi_v;
+  using std::numbers::inv_sqrt3_v;
+  using std::numbers::inv_sqrtpi_v;
+  using std::numbers::ln10_v;
+  using std::numbers::ln2_v;
+  using std::numbers::log10e_v;
+  using std::numbers::log2e_v;
+  using std::numbers::phi_v;
+  using std::numbers::pi_v;
+  using std::numbers::sqrt2_v;
+  using std::numbers::sqrt3_v;
+
+  using std::numbers::e;
+  using std::numbers::egamma;
+  using std::numbers::inv_pi;
+  using std::numbers::inv_sqrt3;
+  using std::numbers::inv_sqrtpi;
+  using std::numbers::ln10;
+  using std::numbers::ln2;
+  using std::numbers::log10e;
+  using std::numbers::log2e;
+  using std::numbers::phi;
+  using std::numbers::pi;
+  using std::numbers::sqrt2;
+  using std::numbers::sqrt3;
+} // namespace std::numbers

libcxx/modules/std/numeric.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <numeric>
+
+export module std:numeric;
+export namespace std {
+  // [accumulate], accumulate
+  using std::accumulate;
+
+  // [reduce], reduce
+  using std::reduce;
+
+  // [inner.product], inner product
+  using std::inner_product;
+
+  // [transform.reduce], transform reduce
+  using std::transform_reduce;
+
+  // [partial.sum], partial sum
+  using std::partial_sum;
+
+  // [exclusive.scan], exclusive scan
+  using std::exclusive_scan;
+
+  // [inclusive.scan], inclusive scan
+  using std::inclusive_scan;
+
+  // [transform.exclusive.scan], transform exclusive scan
+  using std::transform_exclusive_scan;
+
+  // [transform.inclusive.scan], transform inclusive scan
+  using std::transform_inclusive_scan;
+
+  // [adjacent.difference], adjacent difference
+  using std::adjacent_difference;
+
+  // [numeric.iota], iota
+  using std::iota;
+
+  namespace ranges {
+    // using std::ranges::iota_result;
+    // using std::ranges::iota;
+  } // namespace ranges
+
+  // [numeric.ops.gcd], greatest common divisor
+  using std::gcd;
+
+  // [numeric.ops.lcm], least common multiple
+  using std::lcm;
+
+  // [numeric.ops.midpoint], midpoint
+  using std::midpoint;
+} // namespace std

libcxx/modules/std/optional.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <optional>
+
+export module std:optional;
+export namespace std {
+  // [optional.optional], class template optional
+  using std::optional;
+
+  // [optional.nullopt], no-value state indicator
+  using std::nullopt;
+  using std::nullopt_t;
+
+  // [optional.bad.access], class bad_optional_access
+  using std::bad_optional_access;
+
+  // [optional.relops], relational operators
+  using std::operator==;
+  using std::operator!=;
+  using std::operator<;
+  using std::operator>;
+  using std::operator<=;
+  using std::operator>=;
+  using std::operator<=>;
+
+  // [optional.specalg], specialized algorithms
+  using std::swap;
+
+  using std::make_optional;
+
+  // [optional.hash], hash support
+  using std::hash;
+} // namespace std

libcxx/modules/std/ostream.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <ostream>
+#endif
+
+export module std:ostream;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::basic_ostream;
+
+  using std::ostream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wostream;
+#  endif
+
+  using std::endl;
+  using std::ends;
+  using std::flush;
+
+#  if 0
+  using std::emit_on_flush;
+  using std::flush_emit;
+  using std::noemit_on_flush;
+#  endif
+  using std::operator<<;
+
+#  if 0
+  // [ostream.formatted.print], print functions
+  using std::print;
+  using std::println;
+
+  using std::vprint_nonunicode;
+  using std::vprint_unicode;
+#  endif
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/print.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<print>)
+#  error "include this header unconditionally and uncomment the exported symbols"
+#  include <print>
+#endif
+
+export module std:print;
+export namespace std {
+#if 0
+  // [print.fun], print functions
+  using std::print;
+  using std::println;
+
+  using std::vprint_nonunicode;
+  using std::vprint_unicode;
+#endif
+} // namespace std

libcxx/modules/std/queue.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <queue>
+
+export module std:queue;
+export namespace std {
+  // [queue], class template queue
+  using std::queue;
+
+  using std::operator==;
+#if 0 // P1614
+  using std::operator<=>;
+#else
+  using std::operator!=;
+  using std::operator<;
+  using std::operator>;
+  using std::operator<=;
+  using std::operator>=;
+#endif
+
+  using std::swap;
+  using std::uses_allocator;
+
+  // [priority.queue], class template priority_queue
+  using std::priority_queue;
+} // namespace std

libcxx/modules/std/random.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <random>
+
+export module std:random;
+export namespace std {
+  // [rand.req.urng], uniform random bit generator requirements
+  using std::uniform_random_bit_generator;
+
+  // [rand.eng.lcong], class template linear_congruential_engine
+  using std::linear_congruential_engine;
+
+  // [rand.eng.mers], class template mersenne_twister_engine
+  using std::mersenne_twister_engine;
+
+  // [rand.eng.sub], class template subtract_with_carry_engine
+  using std::subtract_with_carry_engine;
+
+  // [rand.adapt.disc], class template discard_block_engine
+  using std::discard_block_engine;
+
+  // [rand.adapt.ibits], class template independent_bits_engine
+  using std::independent_bits_engine;
+
+  // [rand.adapt.shuf], class template shuffle_order_engine
+  using std::shuffle_order_engine;
+
+  // [rand.predef], engines and engine adaptors with predefined parameters
+  using std::knuth_b;
+  using std::minstd_rand;
+  using std::minstd_rand0;
+  using std::mt19937;
+  using std::mt19937_64;
+  using std::ranlux24;
+  using std::ranlux24_base;
+  using std::ranlux48;
+  using std::ranlux48_base;
+
+  using std::default_random_engine;
+
+  // [rand.device], class random_device
+  using std::random_device;
+
+  // [rand.util.seedseq], class seed_seq
+  using std::seed_seq;
+
+  // [rand.util.canonical], function template generate_canonical
+  using std::generate_canonical;
+
+  // [rand.dist.uni.int], class template uniform_int_distribution
+  using std::uniform_int_distribution;
+
+  // [rand.dist.uni.real], class template uniform_real_distribution
+  using std::uniform_real_distribution;
+
+  // [rand.dist.bern.bernoulli], class bernoulli_distribution
+  using std::bernoulli_distribution;
+
+  // [rand.dist.bern.bin], class template binomial_distribution
+  using std::binomial_distribution;
+
+  // [rand.dist.bern.geo], class template geometric_distribution
+  using std::geometric_distribution;
+
+  // [rand.dist.bern.negbin], class template negative_binomial_distribution
+  using std::negative_binomial_distribution;
+
+  // [rand.dist.pois.poisson], class template poisson_distribution
+  using std::poisson_distribution;
+
+  // [rand.dist.pois.exp], class template exponential_distribution
+  using std::exponential_distribution;
+
+  // [rand.dist.pois.gamma], class template gamma_distribution
+  using std::gamma_distribution;
+
+  // [rand.dist.pois.weibull], class template weibull_distribution
+  using std::weibull_distribution;
+
+  // [rand.dist.pois.extreme], class template extreme_value_distribution
+  using std::extreme_value_distribution;
+
+  // [rand.dist.norm.normal], class template normal_distribution
+  using std::normal_distribution;
+
+  // [rand.dist.norm.lognormal], class template lognormal_distribution
+  using std::lognormal_distribution;
+
+  // [rand.dist.norm.chisq], class template chi_squared_distribution
+  using std::chi_squared_distribution;
+
+  // [rand.dist.norm.cauchy], class template cauchy_distribution
+  using std::cauchy_distribution;
+
+  // [rand.dist.norm.f], class template fisher_f_distribution
+  using std::fisher_f_distribution;
+
+  // [rand.dist.norm.t], class template student_t_distribution
+  using std::student_t_distribution;
+
+  // [rand.dist.samp.discrete], class template discrete_distribution
+  using std::discrete_distribution;
+
+  // [rand.dist.samp.pconst], class template piecewise_constant_distribution
+  using std::piecewise_constant_distribution;
+
+  // [rand.dist.samp.plinear], class template piecewise_linear_distribution
+  using std::piecewise_linear_distribution;
+} // namespace std

libcxx/modules/std/ranges.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <ranges>
+
+export module std:ranges;
+export namespace std {
+  namespace ranges {
+    inline namespace __cpo {
+      // [range.access], range access
+      using std::ranges::__cpo::begin;
+      using std::ranges::__cpo::cbegin;
+      using std::ranges::__cpo::cend;
+      using std::ranges::__cpo::crbegin;
+      using std::ranges::__cpo::crend;
+      using std::ranges::__cpo::end;
+      using std::ranges::__cpo::rbegin;
+      using std::ranges::__cpo::rend;
+
+      using std::ranges::__cpo::cdata;
+      using std::ranges::__cpo::data;
+      using std::ranges::__cpo::empty;
+      using std::ranges::__cpo::size;
+      using std::ranges::__cpo::ssize;
+    } // namespace __cpo
+
+    // [range.range], ranges
+    using std::ranges::range;
+
+    using std::ranges::enable_borrowed_range;
+
+    using std::ranges::borrowed_range;
+
+    // using std::ranges::const_iterator_t;
+    // using std::ranges::const_sentinel_t;
+    using std::ranges::iterator_t;
+    // using std::ranges::range_const_reference_t;
+    using std::ranges::range_common_reference_t;
+    using std::ranges::range_difference_t;
+    using std::ranges::range_reference_t;
+    using std::ranges::range_rvalue_reference_t;
+    using std::ranges::range_size_t;
+    using std::ranges::range_value_t;
+    using std::ranges::sentinel_t;
+
+    // [range.sized], sized ranges
+    using std::ranges::disable_sized_range;
+    using std::ranges::sized_range;
+
+    // [range.view], views
+    using std::ranges::enable_view;
+    using std::ranges::view;
+    using std::ranges::view_base;
+
+    // [range.refinements], other range refinements
+    using std::ranges::bidirectional_range;
+    using std::ranges::common_range;
+    // using std::ranges::constant_range;
+    using std::ranges::contiguous_range;
+    using std::ranges::forward_range;
+    using std::ranges::input_range;
+    using std::ranges::output_range;
+    using std::ranges::random_access_range;
+    using std::ranges::viewable_range;
+
+    // [view.interface], class template view_­interface
+    using std::ranges::view_interface;
+
+    // [range.subrange], sub-ranges
+    using std::ranges::subrange;
+    using std::ranges::subrange_kind;
+
+    using std::ranges::get;
+  } // namespace ranges
+
+  using std::ranges::get;
+
+  namespace ranges {
+
+    // [range.dangling], dangling iterator handling
+    using std::ranges::dangling;
+
+    // [range.elementsof], class template elements_­of
+    // using std::ranges::elements_of;
+
+    using std::ranges::borrowed_iterator_t;
+
+    using std::ranges::borrowed_subrange_t;
+
+    // [range.utility.conv], range conversions
+    // using std::ranges::to;
+
+    // [range.empty], empty view
+    using std::ranges::empty_view;
+
+    namespace views {
+      using std::ranges::views::empty;
+    }
+
+    // [range.single], single view
+    using std::ranges::single_view;
+
+    namespace views {
+      using std::ranges::views::single;
+    } // namespace views
+
+    // [range.iota], iota view
+    using std::ranges::iota_view;
+
+    namespace views {
+      using std::ranges::views::iota;
+    } // namespace views
+
+    // [range.repeat], repeat view
+#if 0
+    using std::ranges::repeat_view;
+
+    namespace views {
+      using std::ranges::views::repeat;
+    } // namespace views
+#endif
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+    // [range.istream], istream view
+    using std::ranges::basic_istream_view;
+    using std::ranges::istream_view;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+    using std::ranges::wistream_view;
+#  endif
+
+    namespace views {
+      using std::ranges::views::istream;
+    }
+#endif // _LIBCPP_HAS_NO_LOCALIZATION
+
+    // [range.adaptor.object], range adaptor objects
+    // using std::ranges::range_adaptor_closure;
+
+    // [range.all], all view
+    namespace views {
+      using std::ranges::views::all;
+      using std::ranges::views::all_t;
+    } // namespace views
+
+    // [range.ref.view], ref view
+    using std::ranges::ref_view;
+
+    // [range.owning.view], owning view
+    using std::ranges::owning_view;
+
+    // [range.as.rvalue], as rvalue view
+    using std::ranges::as_rvalue_view;
+
+    namespace views {
+      using std::ranges::views::as_rvalue;
+    } // namespace views
+
+    // [range.filter], filter view
+    using std::ranges::filter_view;
+
+    namespace views {
+      using std::ranges::views::filter;
+    } // namespace views
+
+    // [range.transform], transform view
+    using std::ranges::transform_view;
+
+    namespace views {
+      using std::ranges::views::transform;
+    } // namespace views
+
+    // [range.take], take view
+    using std::ranges::take_view;
+
+    namespace views {
+      using std::ranges::views::take;
+    } // namespace views
+
+    // [range.take.while], take while view
+    using std::ranges::take_while_view;
+
+    namespace views {
+      using std::ranges::views::take_while;
+    } // namespace views
+
+    // [range.drop], drop view
+    using std::ranges::drop_view;
+
+    namespace views {
+      using std::ranges::views::drop;
+    } // namespace views
+
+    // [range.drop.while], drop while view
+    using std::ranges::drop_while_view;
+
+    namespace views {
+      using std::ranges::views::drop_while;
+    } // namespace views
+
+    using std::ranges::join_view;
+
+    namespace views {
+      using std::ranges::views::join;
+    } // namespace views
+#if 0
+    using std::ranges::join_with_view;
+
+    namespace views {
+      using std::ranges::views::join_with;
+    } // namespace views
+#endif
+    using std::ranges::lazy_split_view;
+
+    // [range.split], split view
+    using std::ranges::split_view;
+
+    namespace views {
+      using std::ranges::views::lazy_split;
+      using std::ranges::views::split;
+    } // namespace views
+
+    // [range.counted], counted view
+    namespace views {
+      using std::ranges::views::counted;
+    } // namespace views
+
+    // [range.common], common view
+    using std::ranges::common_view;
+
+    namespace views {
+      using std::ranges::views::common;
+    } // namespace views
+
+    // [range.reverse], reverse view
+    using std::ranges::reverse_view;
+
+    namespace views {
+      using std::ranges::views::reverse;
+    } // namespace views
+
+    // [range.as.const], as const view
+#if 0
+    using std::ranges::as_const_view;
+
+    namespace views {
+      using std::ranges::views::as_const;
+    } // namespace views
+#endif
+    // [range.elements], elements view
+    using std::ranges::elements_view;
+
+    using std::ranges::keys_view;
+    using std::ranges::values_view;
+
+    namespace views {
+      using std::ranges::views::elements;
+      using std::ranges::views::keys;
+      using std::ranges::views::values;
+    } // namespace views
+
+    // [range.zip], zip view
+    using std::ranges::zip_view;
+
+    namespace views {
+      using std::ranges::views::zip;
+    } // namespace views
+
+#if 0
+    // [range.zip.transform], zip transform view
+    using std::ranges::zip_transform_view;
+
+    namespace views {
+      using std::ranges::views::zip_transform;
+    }
+
+    using std::ranges::adjacent_view;
+
+    namespace views {
+      using std::ranges::views::adjacent;
+      using std::ranges::views::pairwise;
+    } // namespace views
+
+    using std::ranges::adjacent_transform_view;
+
+    namespace views {
+      using std::ranges::views::adjacent_transform;
+      using std::ranges::views::pairwise_transform;
+    } // namespace views
+
+    using std::ranges::chunk_view;
+
+    using std::ranges::chunk_view<V>;
+
+    namespace views {
+      using std::ranges::views::chunk;
+    }
+
+    using std::ranges::slide_view;
+
+    namespace views {
+      using std::ranges::views::slide;
+    }
+
+    // [range.chunk.by], chunk by view
+    using std::ranges::chunk_by_view;
+
+    namespace views {
+      using std::ranges::views::chunk_by;
+    }
+
+    // [range.stride], stride view
+    using std::ranges::stride_view;
+
+    namespace views {
+      using std::ranges::views::stride;
+    }
+
+    using std::ranges::cartesian_product_view;
+
+    namespace views {
+      using std::ranges::views::cartesian_product;
+    }
+#endif
+  } // namespace ranges
+
+  namespace views = ranges::views;
+
+  using std::tuple_element;
+  using std::tuple_size;
+
+  using std::from_range;
+  using std::from_range_t;
+} // namespace std

libcxx/modules/std/ratio.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <ratio>
+
+export module std:ratio;
+export namespace std {
+  // [ratio.ratio], class template ratio
+  using std::ratio;
+
+  // [ratio.arithmetic], ratio arithmetic
+  using std::ratio_add;
+  using std::ratio_divide;
+  using std::ratio_multiply;
+  using std::ratio_subtract;
+
+  // [ratio.comparison], ratio comparison
+  using std::ratio_equal;
+  using std::ratio_greater;
+  using std::ratio_greater_equal;
+  using std::ratio_less;
+  using std::ratio_less_equal;
+  using std::ratio_not_equal;
+
+  using std::ratio_equal_v;
+  using std::ratio_greater_equal_v;
+  using std::ratio_greater_v;
+  using std::ratio_less_equal_v;
+  using std::ratio_less_v;
+  using std::ratio_not_equal_v;
+
+  // [ratio.si], convenience SI typedefs
+  using std::atto;
+  using std::centi;
+  using std::deca;
+  using std::deci;
+  using std::exa;
+  using std::femto;
+  using std::giga;
+  using std::hecto;
+  using std::kilo;
+  using std::mega;
+  using std::micro;
+  using std::milli;
+  using std::nano;
+  using std::peta;
+  using std::pico;
+  using std::tera;
+
+  // These are not supported by libc++, due to the range of intmax_t
+  // using std::yocto;
+  // using std::yotta;
+  // using std::zepto;
+  // using std::zetta
+} // namespace std

libcxx/modules/std/regex.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <regex>
+#endif
+
+export module std:regex;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  // [re.const], regex constants
+  namespace regex_constants {
+    using std::regex_constants::error_type;
+    using std::regex_constants::match_flag_type;
+    using std::regex_constants::syntax_option_type;
+
+    // regex_constants is a bitmask type.
+    // [bitmask.types] specified operators
+    using std::regex_constants::operator&;
+    using std::regex_constants::operator&=;
+    using std::regex_constants::operator^;
+    using std::regex_constants::operator^=;
+    using std::regex_constants::operator|;
+    using std::regex_constants::operator|=;
+    using std::regex_constants::operator~;
+
+  } // namespace regex_constants
+
+  // [re.badexp], class regex_error
+  using std::regex_error;
+
+  // [re.traits], class template regex_traits
+  using std::regex_traits;
+
+  // [re.regex], class template basic_regex
+  using std::basic_regex;
+
+  using std::regex;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wregex;
+#  endif
+
+  // [re.regex.swap], basic_regex swap
+  using std::swap;
+
+  // [re.submatch], class template sub_match
+  using std::sub_match;
+
+  using std::csub_match;
+  using std::ssub_match;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wcsub_match;
+  using std::wssub_match;
+#  endif
+
+  // [re.submatch.op], sub_match non-member operators
+  using std::operator==;
+  using std::operator<=>;
+#  if 1 // P1614
+  using std::operator!=;
+#  endif
+
+  using std::operator<<;
+
+  // [re.results], class template match_results
+  using std::match_results;
+
+  using std::cmatch;
+  using std::smatch;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wcmatch;
+  using std::wsmatch;
+#  endif
+
+  // match_results comparisons
+
+  // [re.results.swap], match_results swap
+
+  // [re.alg.match], function template regex_match
+  using std::regex_match;
+
+  // [re.alg.search], function template regex_search
+  using std::regex_search;
+
+  // [re.alg.replace], function template regex_replace
+  using std::regex_replace;
+
+  // [re.regiter], class template regex_iterator
+  using std::regex_iterator;
+
+  using std::cregex_iterator;
+  using std::sregex_iterator;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wcregex_iterator;
+  using std::wsregex_iterator;
+#  endif
+
+  // [re.tokiter], class template regex_token_iterator
+  using std::regex_token_iterator;
+
+  using std::cregex_token_iterator;
+  using std::sregex_token_iterator;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wcregex_token_iterator;
+  using std::wsregex_token_iterator;
+#  endif
+
+  namespace pmr {
+    using std::pmr::match_results;
+
+    using std::pmr::cmatch;
+    using std::pmr::smatch;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+    using std::pmr::wcmatch;
+    using std::pmr::wsmatch;
+#  endif
+  } // namespace pmr
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/scoped_allocator.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <scoped_allocator>
+
+export module std:scoped_allocator;
+export namespace std {
+  // class template scoped_allocator_adaptor
+  using std::scoped_allocator_adaptor;
+
+  // [scoped.adaptor.operators], scoped allocator operators
+  using std::operator==;
+#if 1 // P1614
+  using std::operator!=;
+#endif
+
+} // namespace std

libcxx/modules/std/semaphore.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <semaphore>
+
+export module std:semaphore;
+export namespace std {
+  // [thread.sema.cnt], class template counting_semaphore
+  using std::counting_semaphore;
+
+  using std::binary_semaphore;
+} // namespace std

libcxx/modules/std/set.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <set>
+
+export module std:set;
+export namespace std {
+  // [set], class template set
+  using std::set;
+
+  using std::operator==;
+#if 0 // P1614
+  using std::operator<=>;
+#else
+  using std::operator!=;
+  using std::operator<;
+  using std::operator>;
+  using std::operator<=;
+  using std::operator>=;
+#endif
+
+  using std::swap;
+
+  // [set.erasure], erasure for set
+  using std::erase_if;
+
+  // [multiset], class template multiset
+  using std::multiset;
+
+  namespace pmr {
+    using std::pmr::multiset;
+    using std::pmr::set;
+  } // namespace pmr
+} // namespace std

libcxx/modules/std/shared_mutex.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <shared_mutex>
+
+export module std:shared_mutex;
+export namespace std {
+  // [thread.sharedmutex.class], class shared_­mutex
+  using std::shared_mutex;
+  // [thread.sharedtimedmutex.class], class shared_­timed_­mutex
+  using std::shared_timed_mutex;
+  // [thread.lock.shared], class template shared_­lock
+  using std::shared_lock;
+  using std::swap;
+} // namespace std

libcxx/modules/std/source_location.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <source_location>
+
+export module std:source_location;
+export namespace std {
+  using std::source_location;
+} // namespace std

libcxx/modules/std/span.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <span>
+
+export module std:span;
+export namespace std {
+  // constants
+  using std::dynamic_extent;
+
+  // [views.span], class template span
+  using std::span;
+
+  namespace ranges {
+    using std::ranges::enable_borrowed_range;
+    using std::ranges::enable_view;
+  } // namespace ranges
+
+  // [span.objectrep], views of object representation
+  using std::as_bytes;
+
+  using std::as_writable_bytes;
+} // namespace std

libcxx/modules/std/spanstream.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<spanstream>)
+#  error "include this header unconditionally and uncomment the exported symbols"
+#  include <spanstream>
+#endif
+
+export module std:spanstream;
+export namespace std {
+#if 0
+  using std::basic_spanbuf;
+
+  using std::swap;
+
+  using std::spanbuf;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wspanbuf;
+#  endif
+
+  using std::basic_ispanstream;
+
+  using std::ispanstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wispanstream;
+#  endif
+
+  using std::basic_ospanstream;
+
+  using std::ospanstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wospanstream;
+#  endif
+
+  using std::basic_spanstream;
+
+  using std::spanstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wspanstream;
+#  endif
+#endif
+} // namespace std

libcxx/modules/std/sstream.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <sstream>
+#endif
+
+export module std:sstream;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::basic_stringbuf;
+
+  using std::swap;
+
+  using std::stringbuf;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wstringbuf;
+#  endif
+
+  using std::basic_istringstream;
+
+  using std::istringstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wistringstream;
+#  endif
+
+  using std::basic_ostringstream;
+
+  using std::ostringstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wostringstream;
+#  endif
+
+  using std::basic_stringstream;
+
+  using std::stringstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wstringstream;
+#  endif
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/stack.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <stack>
+
+export module std:stack;
+export namespace std {
+  // [stack], class template stack
+  using std::stack;
+
+  using std::operator==;
+  using std::operator!=;
+  using std::operator<;
+  using std::operator>;
+  using std::operator<=;
+  using std::operator>=;
+#if 0 // P1614
+  using std::operator<=>;
+#endif
+
+  using std::swap;
+  using std::uses_allocator;
+} // namespace std

libcxx/modules/std/stacktrace.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<stacktrace>)
+#  error "include this header unconditionally and uncomment the exported symbols"
+#  include <stacktrace>
+#endif
+
+export module std:stacktrace;
+export namespace std {
+#if 0
+  // [stacktrace.entry], class stacktrace_­entry
+  using std::stacktrace_entry;
+
+  // [stacktrace.basic], class template basic_­stacktrace
+  using std::basic_stacktrace;
+
+  // basic_­stacktrace typedef-names
+  using std::stacktrace;
+
+  // [stacktrace.basic.nonmem], non-member functions
+  using std::swap;
+
+  using std::to_string;
+
+  using std::operator<<;
+
+  namespace pmr {
+    using std::pmr::stacktrace;
+  }
+
+  // [stacktrace.basic.hash], hash support
+  using std::hash;
+#endif
+} // namespace std

libcxx/modules/std/stdexcept.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <stdexcept>
+
+export module std:stdexcept;
+export namespace std {
+  using std::domain_error;
+  using std::invalid_argument;
+  using std::length_error;
+  using std::logic_error;
+  using std::out_of_range;
+  using std::overflow_error;
+  using std::range_error;
+  using std::runtime_error;
+  using std::underflow_error;
+} // namespace std

libcxx/modules/std/stdfloat.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<stdfloat>)
+#  error "include this header unconditionally"
+#  include <stdfloat>
+#endif
+
+export module std:stdfloat;
+export namespace std {
+#if defined(__STDCPP_FLOAT16_T__)
+  using std::float16_t;
+#endif
+#if defined(__STDCPP_FLOAT32_T__)
+  using std::float32_t;
+#endif
+#if defined(__STDCPP_FLOAT64_T__)
+  using std::float64_t;
+#endif
+#if defined(__STDCPP_FLOAT128_T__)
+  using std::float128_t;
+#endif
+#if defined(__STDCPP_BFLOAT16_T__)
+  using std::bfloat16_t;
+#endif
+} // namespace std

libcxx/modules/std/stop_token.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<stop_token>) // D145183 contains a patch for this header
+#  error "include this header unconditionally and uncomment the exported symbols"
+#  include <stop_token>
+#endif
+
+export module std:stop_token;
+export namespace std {
+#if 0
+  // [stoptoken], class stop_­token
+  using std::stop_token;
+
+  // [stopsource], class stop_­source
+  using std::stop_source;
+
+  // no-shared-stop-state indicator
+  using std::nostopstate;
+  using std::nostopstate_t;
+
+  // [stopcallback], class template stop_­callback
+  using std::stop_callback;
+#endif
+} // namespace std

libcxx/modules/std/streambuf.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <streambuf>
+#endif
+
+export module std:streambuf;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::basic_streambuf;
+  using std::streambuf;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wstreambuf;
+#  endif
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/string.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <string>
+
+export module std:string;
+export namespace std {
+  // [char.traits], character traits
+  using std::char_traits;
+
+  // [basic.string], basic_string
+  using std::basic_string;
+
+  using std::operator+;
+  using std::operator==;
+  using std::operator<=>;
+
+  // [string.special], swap
+  using std::swap;
+
+  // [string.io], inserters and extractors
+  using std::operator>>;
+  using std::operator<<;
+  using std::getline;
+
+  // [string.erasure], erasure
+  using std::erase;
+  using std::erase_if;
+
+  // basic_string typedef-names
+  using std::string;
+  using std::u16string;
+  using std::u32string;
+  using std::u8string;
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wstring;
+#endif
+
+  // [string.conversions], numeric conversions
+  using std::stod;
+  using std::stof;
+  using std::stoi;
+  using std::stol;
+  using std::stold;
+  using std::stoll;
+  using std::stoul;
+  using std::stoull;
+  using std::to_string;
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::to_wstring;
+#endif
+
+  namespace pmr {
+    using std::pmr::basic_string;
+    using std::pmr::string;
+    using std::pmr::u16string;
+    using std::pmr::u32string;
+    using std::pmr::u8string;
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+    using std::pmr::wstring;
+#endif
+  } // namespace pmr
+
+  // [basic.string.hash], hash support
+  using std::hash;
+
+  inline namespace literals {
+    inline namespace string_literals {
+      // [basic.string.literals], suffix for basic_string literals
+      using std::literals::string_literals::operator""s;
+    } // namespace string_literals
+  }   // namespace literals
+} // namespace std

libcxx/modules/std/string_view.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <string_view>
+
+export module std:string_view;
+export namespace std {
+  // [string.view.template], class template basic_string_view
+  using std::basic_string_view;
+
+  namespace ranges {
+    using std::ranges::enable_borrowed_range;
+    using std::ranges::enable_view;
+  } // namespace ranges
+
+  // [string.view.comparison], non-member comparison functions
+  using std::operator==;
+  using std::operator<=>;
+
+  // [string.view.io], inserters and extractors
+  using std::operator<<;
+
+  // basic_string_view typedef-names
+  using std::string_view;
+  using std::u16string_view;
+  using std::u32string_view;
+  using std::u8string_view;
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wstring_view;
+#endif
+
+  // [string.view.hash], hash support
+  using std::hash;
+
+  inline namespace literals {
+    inline namespace string_view_literals {
+      // [string.view.literals], suffix for basic_string_view literals
+      using std::literals::string_view_literals::operator"" sv;
+    } // namespace string_view_literals
+  }   // namespace literals
+} // namespace std

libcxx/modules/std/strstream.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <__config>
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+#  include <strstream>
+#endif
+
+export module std:strstream;
+#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+export namespace std {
+  using std::istrstream;
+  using std::ostrstream;
+  using std::strstream;
+  using std::strstreambuf;
+} // namespace std
+#endif // _LIBCPP_HAS_NO_LOCALIZATION

libcxx/modules/std/syncstream.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#if __has_include(<syncstream>)
+#  error "include this header unconditionally and uncomment the exported symbols"
+#  include <syncstream>
+#endif
+
+export module std:syncstream;
+export namespace std {
+#if 0
+  using std::basic_syncbuf;
+
+  // [syncstream.syncbuf.special], specialized algorithms
+  using std::swap;
+
+  using std::syncbuf;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wsyncbuf;
+#  endif
+  using std::basic_osyncstream;
+
+  using std::osyncstream;
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+  using std::wosyncstream;
+#  endif
+#endif
+} // namespace std

libcxx/modules/std/system_error.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <system_error>
+
+export module std:system_error;
+export namespace std {
+  using std::error_category;
+  using std::generic_category;
+  using std::system_category;
+
+  using std::error_code;
+  using std::error_condition;
+  using std::system_error;
+
+  using std::is_error_code_enum;
+  using std::is_error_condition_enum;
+
+  using std::errc;
+
+  // [syserr.errcode.nonmembers], non-member functions
+  using std::make_error_code;
+
+  using std::operator<<;
+
+  // [syserr.errcondition.nonmembers], non-member functions
+  using std::make_error_condition;
+
+  // [syserr.compare], comparison operator functions
+  using std::operator==;
+  using std::operator<=>;
+
+  // [syserr.hash], hash support
+  using std::hash;
+
+  // [syserr], system error support
+  using std::is_error_code_enum_v;
+  using std::is_error_condition_enum_v;
+} // namespace std

libcxx/modules/std/thread.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <thread>
+
+export module std:thread;
+export namespace std {
+  // [thread.thread.class], class thread
+  using std::thread;
+
+  using std::swap;
+
+  // [thread.jthread.class], class jthread
+  // using std::jthread;
+
+  // [thread.thread.this], namespace this_thread
+  namespace this_thread {
+    using std::this_thread::get_id;
+
+    using std::this_thread::sleep_for;
+    using std::this_thread::sleep_until;
+    using std::this_thread::yield;
+  } // namespace this_thread
+
+  // [thread.thread.id]
+  using std::operator==;
+  using std::operator<=>;
+  using std::operator<<;
+
+  using std::formatter;
+
+  using std::hash;
+} // namespace std

libcxx/modules/std/tuple.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <tuple>
+
+export module std:tuple;
+export namespace std {
+  // [tuple.tuple], class template tuple
+  using std::tuple;
+
+  // [tuple.like], concept tuple-like
+
+  // [tuple.common.ref], common_reference related specializations
+  using std::basic_common_reference;
+  using std::common_type;
+
+  // [tuple.creation], tuple creation functions
+  using std::ignore;
+
+  using std::forward_as_tuple;
+  using std::make_tuple;
+  using std::tie;
+  using std::tuple_cat;
+
+  // [tuple.apply], calling a function with a tuple of arguments
+  using std::apply;
+
+  using std::make_from_tuple;
+
+  // [tuple.helper], tuple helper classes
+  using std::tuple_element;
+  using std::tuple_size;
+
+  using std::tuple_element_t;
+
+  // [tuple.elem], element access
+  using std::get;
+  using std::tuple_element_t;
+
+  // [tuple.rel], relational operators
+  using std::operator==;
+  using std::operator<=>;
+
+  // [tuple.traits], allocator-related traits
+  using std::uses_allocator;
+
+  // [tuple.special], specialized algorithms
+  using std::swap;
+
+  // [tuple.helper], tuple helper classes
+  using std::tuple_size_v;
+} // namespace std

libcxx/modules/std/type_traits.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <type_traits>
+export module std:type_traits;
+export namespace std {
+  // [meta.help], helper class
+  using std::integral_constant;
+
+  using std::bool_constant;
+  using std::false_type;
+  using std::true_type;
+
+  // [meta.unary.cat], primary type categories
+  using std::is_array;
+  using std::is_class;
+  using std::is_enum;
+  using std::is_floating_point;
+  using std::is_function;
+  using std::is_integral;
+  using std::is_lvalue_reference;
+  using std::is_member_function_pointer;
+  using std::is_member_object_pointer;
+  using std::is_null_pointer;
+  using std::is_pointer;
+  using std::is_rvalue_reference;
+  using std::is_union;
+  using std::is_void;
+
+  // [meta.unary.comp], composite type categories
+  using std::is_arithmetic;
+  using std::is_compound;
+  using std::is_fundamental;
+  using std::is_member_pointer;
+  using std::is_object;
+  using std::is_reference;
+  using std::is_scalar;
+
+  // [meta.unary.prop], type properties
+  using std::is_abstract;
+  using std::is_aggregate;
+  using std::is_const;
+  using std::is_empty;
+  using std::is_final;
+  using std::is_polymorphic;
+  using std::is_standard_layout;
+  using std::is_trivial;
+  using std::is_trivially_copyable;
+  using std::is_volatile;
+
+  using std::is_bounded_array;
+  using std::is_scoped_enum;
+  using std::is_signed;
+  using std::is_unbounded_array;
+  using std::is_unsigned;
+
+  using std::is_constructible;
+  using std::is_copy_constructible;
+  using std::is_default_constructible;
+  using std::is_move_constructible;
+
+  using std::is_assignable;
+  using std::is_copy_assignable;
+  using std::is_move_assignable;
+
+  using std::is_swappable;
+  using std::is_swappable_with;
+
+  using std::is_destructible;
+
+  using std::is_trivially_constructible;
+  using std::is_trivially_copy_constructible;
+  using std::is_trivially_default_constructible;
+  using std::is_trivially_move_constructible;
+
+  using std::is_trivially_assignable;
+  using std::is_trivially_copy_assignable;
+  using std::is_trivially_destructible;
+  using std::is_trivially_move_assignable;
+
+  using std::is_nothrow_constructible;
+  using std::is_nothrow_copy_constructible;
+  using std::is_nothrow_default_constructible;
+  using std::is_nothrow_move_constructible;
+
+  using std::is_nothrow_assignable;
+  using std::is_nothrow_copy_assignable;
+  using std::is_nothrow_move_assignable;
+
+  using std::is_nothrow_swappable;
+  using std::is_nothrow_swappable_with;
+
+  using std::is_nothrow_destructible;
+
+  //  using std::is_implicit_lifetime;
+
+  using std::has_virtual_destructor;
+
+  using std::has_unique_object_representations;
+
+  // using std::reference_constructs_from_temporary;
+  // using std::reference_converts_from_temporary;
+
+  // [meta.unary.prop.query], type property queries
+  using std::alignment_of;
+  using std::extent;
+  using std::rank;
+
+  // [meta.rel], type relations
+  using std::is_base_of;
+  using std::is_convertible;
+  // using std::is_layout_compatible;
+  using std::is_nothrow_convertible;
+  // using std::is_pointer_interconvertible_base_of;
+  using std::is_same;
+
+  using std::is_invocable;
+  using std::is_invocable_r;
+
+  using std::is_nothrow_invocable;
+  using std::is_nothrow_invocable_r;
+
+  // [meta.trans.cv], const-volatile modifications
+  using std::add_const;
+  using std::add_cv;
+  using std::add_volatile;
+  using std::remove_const;
+  using std::remove_cv;
+  using std::remove_volatile;
+
+  using std::add_const_t;
+  using std::add_cv_t;
+  using std::add_volatile_t;
+  using std::remove_const_t;
+  using std::remove_cv_t;
+  using std::remove_volatile_t;
+
+  // [meta.trans.ref], reference modifications
+  using std::add_lvalue_reference;
+  using std::add_rvalue_reference;
+  using std::remove_reference;
+
+  using std::add_lvalue_reference_t;
+  using std::add_rvalue_reference_t;
+  using std::remove_reference_t;
+
+  // [meta.trans.sign], sign modifications
+  using std::make_signed;
+  using std::make_unsigned;
+
+  using std::make_signed_t;
+  using std::make_unsigned_t;
+
+  // [meta.trans.arr], array modifications
+  using std::remove_all_extents;
+  using std::remove_extent;
+
+  using std::remove_all_extents_t;
+  using std::remove_extent_t;
+
+  // [meta.trans.ptr], pointer modifications
+  using std::add_pointer;
+  using std::remove_pointer;
+
+  using std::add_pointer_t;
+  using std::remove_pointer_t;
+
+  // [meta.trans.other], other transformations
+  using std::basic_common_reference;
+  using std::common_reference;
+  using std::common_type;
+  using std::conditional;
+  using std::decay;
+  using std::enable_if;
+  using std::invoke_result;
+  using std::remove_cvref;
+  using std::type_identity;
+  using std::underlying_type;
+  using std::unwrap_ref_decay;
+  using std::unwrap_reference;
+
+  using std::common_reference_t;
+  using std::common_type_t;
+  using std::conditional_t;
+  using std::decay_t;
+  using std::enable_if_t;
+  using std::invoke_result_t;
+  using std::remove_cvref_t;
+  using std::type_identity_t;
+  using std::underlying_type_t;
+  using std::unwrap_ref_decay_t;
+  using std::unwrap_reference_t;
+  using std::void_t;
+
+  // [meta.logical], logical operator traits
+  using std::conjunction;
+  using std::disjunction;
+  using std::negation;
+
+  // [meta.unary.cat], primary type categories
+  using std::is_array_v;
+  using std::is_class_v;
+  using std::is_enum_v;
+  using std::is_floating_point_v;
+  using std::is_function_v;
+  using std::is_integral_v;
+  using std::is_lvalue_reference_v;
+  using std::is_member_function_pointer_v;
+  using std::is_member_object_pointer_v;
+  using std::is_null_pointer_v;
+  using std::is_pointer_v;
+  using std::is_rvalue_reference_v;
+  using std::is_union_v;
+  using std::is_void_v;
+
+  // [meta.unary.comp], composite type categories
+  using std::is_arithmetic_v;
+  using std::is_compound_v;
+  using std::is_fundamental_v;
+  using std::is_member_pointer_v;
+  using std::is_object_v;
+  using std::is_reference_v;
+  using std::is_scalar_v;
+
+  // [meta.unary.prop], type properties
+  using std::has_unique_object_representations_v;
+  using std::has_virtual_destructor_v;
+  using std::is_abstract_v;
+  using std::is_aggregate_v;
+  using std::is_assignable_v;
+  using std::is_bounded_array_v;
+  using std::is_const_v;
+  using std::is_constructible_v;
+  using std::is_copy_assignable_v;
+  using std::is_copy_constructible_v;
+  using std::is_default_constructible_v;
+  using std::is_destructible_v;
+  using std::is_empty_v;
+  using std::is_final_v;
+  // using std::is_implicit_lifetime_v;
+  using std::is_move_assignable_v;
+  using std::is_move_constructible_v;
+  using std::is_nothrow_assignable_v;
+  using std::is_nothrow_constructible_v;
+  using std::is_nothrow_copy_assignable_v;
+  using std::is_nothrow_copy_constructible_v;
+  using std::is_nothrow_default_constructible_v;
+  using std::is_nothrow_destructible_v;
+  using std::is_nothrow_move_assignable_v;
+  using std::is_nothrow_move_constructible_v;
+  using std::is_nothrow_swappable_v;
+  using std::is_nothrow_swappable_with_v;
+  using std::is_polymorphic_v;
+  using std::is_scoped_enum_v;
+  using std::is_signed_v;
+  using std::is_standard_layout_v;
+  using std::is_swappable_v;
+  using std::is_swappable_with_v;
+  using std::is_trivial_v;
+  using std::is_trivially_assignable_v;
+  using std::is_trivially_constructible_v;
+  using std::is_trivially_copy_assignable_v;
+  using std::is_trivially_copy_constructible_v;
+  using std::is_trivially_copyable_v;
+  using std::is_trivially_default_constructible_v;
+  using std::is_trivially_destructible_v;
+  using std::is_trivially_move_assignable_v;
+  using std::is_trivially_move_constructible_v;
+  using std::is_unbounded_array_v;
+  using std::is_unsigned_v;
+  using std::is_volatile_v;
+  // using std::reference_constructs_from_temporary_v;
+  // using std::reference_converts_from_temporary_v;
+
+  // [meta.unary.prop.query], type property queries
+  using std::alignment_of_v;
+  using std::extent_v;
+  using std::rank_v;
+
+  // [meta.rel], type relations
+  using std::is_base_of_v;
+  using std::is_convertible_v;
+  using std::is_invocable_r_v;
+  using std::is_invocable_v;
+  // using std::is_layout_compatible_v;
+  using std::is_nothrow_convertible_v;
+  using std::is_nothrow_invocable_r_v;
+  using std::is_nothrow_invocable_v;
+  // using std::is_pointer_interconvertible_base_of_v;
+  using std::is_same_v;
+
+  // [meta.logical], logical operator traits
+  using std::conjunction_v;
+  using std::disjunction_v;
+  using std::negation_v;
+
+  // [meta.member], member relationships
+  // using std::is_corresponding_member;
+  // using std::is_pointer_interconvertible_with_class;
+
+  // [meta.const.eval], constant evaluation context
+  using std::is_constant_evaluated;
+
+  // [depr.meta.types]
+  using std::aligned_storage;
+  using std::aligned_storage_t;
+  using std::aligned_union;
+  using std::aligned_union_t;
+  using std::is_pod;
+  using std::is_pod_v;
+} // namespace std

libcxx/modules/std/typeindex.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <typeindex>
+
+export module std:typeindex;
+export namespace std {
+  using std::hash;
+  using std::type_index;
+} // namespace std

libcxx/modules/std/typeinfo.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <typeinfo>
+
+export module std:typeinfo;
+export namespace std {
+  using std::bad_cast;
+  using std::bad_typeid;
+  using std::type_info;
+} // namespace std

libcxx/modules/std/unordered_map.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <unordered_map>
+
+export module std:unordered_map;
+export namespace std {
+  // [unord.map], class template unordered_­map
+  using std::unordered_map;
+
+  // [unord.multimap], class template unordered_­multimap
+  using std::unordered_multimap;
+
+  using std::operator==;
+#if 1 // P1614
+  using std::operator!=;
+#endif
+
+  using std::swap;
+
+  // [unord.map.erasure], erasure for unordered_­map
+  using std::erase_if;
+
+  namespace pmr {
+    using std::pmr::unordered_map;
+    using std::pmr::unordered_multimap;
+  } // namespace pmr
+} // namespace std

libcxx/modules/std/unordered_set.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <unordered_set>
+
+export module std:unordered_set;
+export namespace std {
+  // [unord.set], class template unordered_­set
+  using std::unordered_set;
+
+  // [unord.multiset], class template unordered_­multiset
+  using std::unordered_multiset;
+
+  using std::operator==;
+#if 1 // P1614
+  using std::operator!=;
+#endif
+
+  using std::swap;
+
+  // [unord.set.erasure], erasure for unordered_­set
+  using std::erase_if;
+
+  namespace pmr {
+    using std::pmr::unordered_multiset;
+    using std::pmr::unordered_set;
+  } // namespace pmr
+} // namespace std

libcxx/modules/std/utility.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <utility>
+export module std:utility;
+export namespace std {
+  // [utility.swap], swap
+  using std::swap;
+
+  // [utility.exchange], exchange
+  using std::exchange;
+
+  // [forward], forward/move
+  using std::forward;
+  using std::forward_like;
+  using std::move;
+  using std::move_if_noexcept;
+
+  // [utility.as.const], as_const
+  using std::as_const;
+
+  // [declval], declval
+  using std::declval;
+
+  // [utility.intcmp], integer comparison functions
+  using std::cmp_equal;
+  using std::cmp_not_equal;
+
+  using std::cmp_greater;
+  using std::cmp_greater_equal;
+  using std::cmp_less;
+  using std::cmp_less_equal;
+
+  using std::in_range;
+
+  // [utility.underlying], to_underlying
+  using std::to_underlying;
+
+  // [utility.unreachable], unreachable
+  using std::unreachable;
+
+  // [intseq], compile-time integer sequences
+  using std::index_sequence;
+  using std::integer_sequence;
+
+  using std::make_index_sequence;
+  using std::make_integer_sequence;
+
+  using std::index_sequence_for;
+
+  // [pairs], class template pair
+  using std::pair;
+
+  using std::basic_common_reference;
+  using std::common_type;
+  // [pairs.spec], pair specialized algorithms
+  using std::operator==;
+  using std::operator<=>;
+
+  using std::make_pair;
+
+  // [pair.astuple], tuple-like access to pair
+  using std::tuple_element;
+  using std::tuple_size;
+
+  using std::tuple_element;
+  using std::tuple_size;
+
+  using std::get;
+
+  // [pair.piecewise], pair piecewise construction
+  using std::piecewise_construct;
+  using std::piecewise_construct_t;
+
+  // in-place construction
+  using std::in_place;
+  using std::in_place_t;
+
+  using std::in_place_type;
+  using std::in_place_type_t;
+
+  using std::in_place_index;
+  using std::in_place_index_t;
+
+  // [depr.relops]
+  namespace rel_ops {
+    using rel_ops::operator!=;
+    using rel_ops::operator>;
+    using rel_ops::operator<=;
+    using rel_ops::operator>=;
+  } // namespace rel_ops
+} // namespace std

libcxx/modules/std/valarray.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <valarray>
+
+export module std:valarray;
+export namespace std {
+  using std::gslice;
+  using std::gslice_array;
+  using std::indirect_array;
+  using std::mask_array;
+  using std::slice;
+  using std::slice_array;
+  using std::valarray;
+
+  using std::swap;
+
+  using std::operator*;
+  using std::operator/;
+  using std::operator%;
+  using std::operator+;
+  using std::operator-;
+
+  using std::operator^;
+  using std::operator&;
+  using std::operator|;
+
+  using std::operator<<;
+  using std::operator>>;
+
+  using std::operator&&;
+  using std::operator||;
+
+  using std::operator==;
+  using std::operator!=;
+
+  using std::operator<;
+  using std::operator>;
+  using std::operator<=;
+  using std::operator>=;
+
+  using std::abs;
+  using std::acos;
+  using std::asin;
+  using std::atan;
+
+  using std::atan2;
+
+  using std::cos;
+  using std::cosh;
+  using std::exp;
+  using std::log;
+  using std::log10;
+
+  using std::pow;
+
+  using std::sin;
+  using std::sinh;
+  using std::sqrt;
+  using std::tan;
+  using std::tanh;
+
+  using std::begin;
+  using std::end;
+} // namespace std

libcxx/modules/std/variant.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <variant>
+
+export module std:variant;
+export namespace std {
+  // [variant.variant], class template variant
+  using std::variant;
+
+  // [variant.helper], variant helper classes
+  using std::variant_alternative;
+  using std::variant_npos;
+  using std::variant_size;
+  using std::variant_size_v;
+
+  // [variant.get], value access
+  using std::get;
+  using std::get_if;
+  using std::holds_alternative;
+  using std::variant_alternative_t;
+
+  // [variant.relops], relational operators
+  using std::operator==;
+  using std::operator!=;
+  using std::operator<;
+  using std::operator>;
+  using std::operator<=;
+  using std::operator>=;
+  using std::operator<=>;
+
+  // [variant.visit], visitation
+  using std::visit;
+
+  // [variant.monostate], class monostate
+  using std::monostate;
+
+  // [variant.specalg], specialized algorithms
+  using std::swap;
+
+  // [variant.bad.access], class bad_variant_access
+  using std::bad_variant_access;
+
+  // [variant.hash], hash support
+  using std::hash;
+} // namespace std

libcxx/modules/std/vector.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <functional>
+#include <vector>
+
+export module std:vector;
+export namespace std {
+  // [vector], class template vector
+  using std::vector;
+
+  using std::operator==;
+#if 0 // P1614
+  using std::operator<=>;
+#else
+  /* These should be removed after https://reviews.llvm.org/D132268 lands. */
+  using std::operator!=;
+  using std::operator<;
+  using std::operator>;
+  using std::operator<=;
+  using std::operator>=;
+#endif
+
+  using std::swap;
+
+  // [vector.erasure], erasure
+  using std::erase;
+  using std::erase_if;
+
+  namespace pmr {
+    using std::pmr::vector;
+  }
+
+  // hash support
+  using std::hash;
+
+  // [vector.bool.fmt], formatter specialization for vector<bool>
+  using std::formatter;
+} // namespace std

libcxx/modules/std/version.cppm

+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <version>
+
+export module std:version;
+export namespace std {
+  // This module exports nothing.
+} // namespace std