[PATCH] D104975: Implement P1949

[Corentin Jabot via Phabricator via cfe-commits]

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This adds the Unicode 13 data for XID_Start and XID_Continue.
The definition of valid identifier is changed in all C++ modes
as P1949 <https://reviews.llvm.org/P1949> was accepted by WG21 as a defect report.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104975

Files:
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/lib/Lex/Lexer.cpp
  clang/lib/Lex/UnicodeCharSets.h
  clang/test/CXX/drs/dr1xx.cpp
  clang/test/CXX/drs/dr2xx.cpp
  clang/test/CXX/drs/dr6xx.cpp
  clang/test/FixIt/fixit-unicode.c
  clang/test/Lexer/unicode.c
  clang/test/Parser/cxx11-user-defined-literals.cpp
  clang/test/Preprocessor/ucn-allowed-chars.c
  clang/test/Preprocessor/ucn-pp-identifier.c
  clang/test/Preprocessor/utf8-allowed-chars.c

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