[PATCH] D105737: Implement delimited escape sequences.

[Corentin Jabot via Phabricator via cfe-commits]

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This is a proposed C++ paper (P2290R1) that has not been accepted yet

\x{XXXX} \u{XXXX} and \o{OOOO} are accepted in all languages mode
in characters and string literals.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105737

Files:
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/lib/Lex/LiteralSupport.cpp
  clang/test/Lexer/char-escapes-delimited.cpp

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