llvm-project

0bc02b99 - [Clang] Instantiate Typedefs referenced by type alias deduction guides (#111804)

[Clang] Instantiate Typedefs referenced by type alias deduction guides (#111804) TypedefNameDecl referenced by a synthesized CTAD guide for type aliases was not transformed previously, resulting in a substitution failure in BuildDeductionGuideForTypeAlias() when substituting into the right-hand-side deduction guide. This patch fixes it in the way we have been doing since https://reviews.llvm.org/D80743. We transform all the function parameters, parenting referenced TypedefNameDecls with the CXXDeductionGuideDecl. Then we instantiate these declarations in FindInstantiatedDecl() as we build up the eventual deduction guide, using the mechanism introduced in D80743 Fixes #111508