Index: lldb/trunk/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
===================================================================
--- lldb/trunk/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
+++ lldb/trunk/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
@@ -486,8 +486,11 @@
       cpp_category_sp,
       lldb_private::formatters::LibcxxStdListSyntheticFrontEndCreator,
       "libc++ std::list synthetic children",
-      ConstString("^std::__[[:alnum:]]+::list<.+>(( )?&)?$"), stl_deref_flags,
-      true);
+      // A POSIX variant of: "^std::__(?!cxx11:)[[:alnum:]]+::list<.+>(( )?&)?$"
+      // so that it does not clash with: "^std::(__cxx11::)?list<.+>(( )?&)?$"
+      ConstString("^std::__([A-Zabd-z0-9]|cx?[A-Za-wyz0-9]|cxx1?[A-Za-z02-9]|"
+                  "cxx11[[:alnum:]])[[:alnum:]]*::list<.+>(( )?&)?$"),
+      stl_deref_flags, true);
   AddCXXSynthetic(
       cpp_category_sp,
       lldb_private::formatters::LibcxxStdMapSyntheticFrontEndCreator,
@@ -583,11 +586,14 @@
                 "libc++ std::list summary provider",
                 ConstString("^std::__[[:alnum:]]+::forward_list<.+>(( )?&)?$"),
                 stl_summary_flags, true);
-  AddCXXSummary(cpp_category_sp,
-                lldb_private::formatters::LibcxxContainerSummaryProvider,
-                "libc++ std::list summary provider",
-                ConstString("^std::__[[:alnum:]]+::list<.+>(( )?&)?$"),
-                stl_summary_flags, true);
+  AddCXXSummary(
+      cpp_category_sp, lldb_private::formatters::LibcxxContainerSummaryProvider,
+      "libc++ std::list summary provider",
+      // A POSIX variant of: "^std::__(?!cxx11:)[[:alnum:]]+::list<.+>(( )?&)?$"
+      // so that it does not clash with: "^std::(__cxx11::)?list<.+>(( )?&)?$"
+      ConstString("^std::__([A-Zabd-z0-9]|cx?[A-Za-wyz0-9]|cxx1?[A-Za-z02-9]|"
+                  "cxx11[[:alnum:]])[[:alnum:]]*::list<.+>(( )?&)?$"),
+      stl_summary_flags, true);
   AddCXXSummary(cpp_category_sp,
                 lldb_private::formatters::LibcxxContainerSummaryProvider,
                 "libc++ std::map summary provider",