[PATCH] D15421: [Feature] Add a builtin for indexing into parameter packs

[Louis Dionne via cfe-commits]

ldionne updated this revision to Diff 58619.
ldionne added a comment.

Rebase the patch on top of the current `master`. The patch passes all of Clang's tests (`make check-clang`). I also removed the TODO comment about diagnostics, since that was answered by Richard Smith.


http://reviews.llvm.org/D15421

Files:
  include/clang/AST/ASTContext.h
  include/clang/AST/DeclTemplate.h
  include/clang/Basic/Builtins.h
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Serialization/ASTBitCodes.h
  lib/AST/ASTContext.cpp
  lib/AST/DeclTemplate.cpp
  lib/Lex/PPMacroExpansion.cpp
  lib/Sema/SemaLookup.cpp
  lib/Sema/SemaTemplate.cpp
  lib/Serialization/ASTReader.cpp
  lib/Serialization/ASTWriter.cpp
  test/PCH/type_pack_element.cpp
  test/SemaCXX/type_pack_element.cpp

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