刘雨培 128b3b61fe [Clang] Defer the instantiation of explicit-specifier until constraint checking completes (#70548) ...

Modifications:

- Skip the instantiation of the explicit-specifier during Decl
substitution if we are deducing template arguments and the
explicit-specifier is value dependent.

- Instantiate the explicit-specifier after the constraint checking
completes.

- Make `instantiateExplicitSpecifier` a member function in order to
instantiate the explicit-specifier in different stages.


This PR doesn’t defer the instantiation of the explicit specifier for
deduction guides, because I’m not familiar with deduction guides yet.
I’ll dig into it after this PR.

According to my local test, GCC 13 tuple works with this PR.

Fixes #59827.

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Co-authored-by: Erich Keane <ekeane@nvidia.com>

2023-11-01 06:45:48 -07:00

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