[clang] [clang] Allow parentheses around CTAD declarators (PR #132829)

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https://github.com/Sirraide commented:

So the implementation of this seems fine, but looking at how other compilers handle this, GCC and MSVC accept this, whereas EDG rejects. I agree w/ the comment that that is a bit silly to reject this, but can you check what the standard has to say about this? If this is disallowed by the standard, we might want to issue an extension warning (disabled by default) here.

https://github.com/llvm/llvm-project/pull/132829