[clang] [FixIt] Improve Source Ranges and Fix-It Hints for Unused Lambda Captures #106445 (PR #117953)

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cor3ntin wrote:

By the time we are in Sema, the ranges should be correct.
I think the issue is somewhere in `Parser::ParseLambdaIntroducer`. It does seem quite confused https://gcc.godbolt.org/z/h7rfEGnMb

In particular, can you check whether `SourceLocation LocEnd = PrevTokLocation;` behave correctly?


https://github.com/llvm/llvm-project/pull/117953