[PATCH] D134853: [clang-format] Correctly annotate UDLs as OverloadedOperator

[Emilia Dreamer via Phabricator via cfe-commits]

rymiel added a comment.

> The operator `""` and the identifier that follows should be two separate tokens regardless if the identifier starts with an underscore.

So, after some investigation, it turns out the clang lexer only combines an underscore-less UDL to a single `string_literal` token if it's a valid standard library UDL (in the given standard library version)

https://github.com/llvm/llvm-project/blob/6f46ff3765dcdc178b9cf52ebd8c03437806798a/clang/lib/Lex/Lexer.cpp#L1960-L1975
https://github.com/llvm/llvm-project/blob/3f18f7c0072b642f5fe88d2fb7bb8ccf69a6c6f5/clang/lib/Lex/LiteralSupport.cpp#L1180-L1185

Which means only single-token `string_literal`s should be considered


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D134853