[PATCH] D14905: [constexpr-lambda] Support parsing of constexpr specifier (and its inference) on lambda expressions

[Faisal Vali via cfe-commits]

faisalv created this revision.
faisalv added reviewers: rsmith, doug.gregor, hubert.reinterpretcast, aaron.ballman, nwilson.
faisalv added a subscriber: cfe-commits.

This patch supports parsing of the constexpr specifier on lambdas - and its inference from the lambda call operator's body.

i.e. 
auto L = [] () constexpr { return 5; };
static_assert(L() == 5); // OK

It does not support evaluation of lambda's within constant expressions, which should follow this patch, when approved.





http://reviews.llvm.org/D14905

Files:
  include/clang/Basic/DiagnosticASTKinds.td
  include/clang/Basic/DiagnosticParseKinds.td
  include/clang/Sema/Sema.h
  lib/AST/ExprConstant.cpp
  lib/Parse/ParseExprCXX.cpp
  lib/Sema/SemaLambda.cpp
  lib/Sema/TreeTransform.h
  test/Parser/cxx1z-constexpr-lambdas.cpp
  test/SemaCXX/cxx1z-constexpr-lambdas.cpp

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