[PATCH] D158372: [Clang] Treat invalid UDL as two tokens

[PoYao Chang via Phabricator via cfe-commits]

rZhBoYao created this revision.
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As a language extension, if an invalid a UDL's suffix can result in macro
expansion, it is treated as if whitespace preceded it. This allows legacy
code to co-exist with new code via -Wno-reserved-user-defined-literal.
The following code results in string concat not calling literal operator.

  const char* s = "FOO"BAR;

Address comments in D153156 <https://reviews.llvm.org/D153156>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158372

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Lex/Lexer.cpp
  clang/lib/Sema/SemaDeclCXX.cpp
  clang/test/CXX/drs/dr14xx.cpp
  clang/test/CXX/drs/dr17xx.cpp
  clang/test/CXX/lex/lex.literal/lex.ext/p10.cpp

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