[PATCH] D23385: Implement __has_constant_initializer(obj) expression traits.

[Eric Fiselier via cfe-commits]

EricWF updated this revision to Diff 67790.
EricWF marked an inline comment as done.
EricWF added a comment.

- Add documentation for `__has_constant_initializer` and expression traits in general.
- Make expression traits detectable using `__has_extension`.


https://reviews.llvm.org/D23385

Files:
  docs/LanguageExtensions.rst
  include/clang/AST/Expr.h
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/ExpressionTraits.h
  include/clang/Basic/TokenKinds.def
  lib/AST/Expr.cpp
  lib/AST/StmtPrinter.cpp
  lib/Lex/PPMacroExpansion.cpp
  lib/Parse/ParseDeclCXX.cpp
  lib/Parse/ParseExpr.cpp
  lib/Parse/ParseExprCXX.cpp
  lib/Sema/SemaExprCXX.cpp
  test/Lexer/has_extension_cxx.cpp
  test/SemaCXX/expression-traits.cpp

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