diff --git a/clang/include/clang/Basic/Features.def b/clang/include/clang/Basic/Features.def
--- a/clang/include/clang/Basic/Features.def
+++ b/clang/include/clang/Basic/Features.def
@@ -216,6 +216,10 @@
 FEATURE(is_trivially_constructible, LangOpts.CPlusPlus)
 FEATURE(is_trivially_copyable, LangOpts.CPlusPlus)
 FEATURE(is_union, LangOpts.CPlusPlus)
+FEATURE(is_same, LangOpts.CPlusPlus)
+FEATURE(is_function, LangOpts.CPlusPlus)
+FEATURE(is_assignable, LangOpts.CPlusPlus)
+FEATURE(is_nothrow_constructible, LangOpts.CPlusPlus)
 FEATURE(modules, LangOpts.Modules)
 FEATURE(safe_stack, LangOpts.Sanitize.has(SanitizerKind::SafeStack))
 FEATURE(shadow_call_stack,