[clang] [Clang] prevent crash in delayed default-argument lambda captures (PR #176749)

[Oleksandr Tarasiuk via cfe-commits]

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a-tarasyuk wrote:

@AaronBallman, Thanks for the feedback. The patch adds the only function scope for delayed default-argument parsing. Without it, lambda capture handling can reach `tryCaptureVariable` without an enclosing entry in `Sema::FunctionScopes`. 

These are two different paths:

1. Delayed default arguments
https://github.com/llvm/llvm-project/blob/61533e7e75abb12492bc98459d97dda4ee7ccae0/clang/lib/Parse/ParseCXXInlineMethods.cpp#L388-L448

2. Delayed exception-specification
https://github.com/llvm/llvm-project/blob/61533e7e75abb12492bc98459d97dda4ee7ccae0/clang/lib/Parse/ParseCXXInlineMethods.cpp#L469-L559

Am I missing something?


https://github.com/llvm/llvm-project/pull/176749