llvm-project

ab5a5a90 - [C++20] [Modules] Fix incorrect diagnostic for using befriend target

[C++20] [Modules] Fix incorrect diagnostic for using befriend target Close https://github.com/llvm/llvm-project/issues/138558 The compiler failed to understand the redeclaration-relationship when performing checks when MergeFunctionDecl. This seemed to be a complex circular problem (how can we know the redeclaration relationship before performing merging?). But the fix seems to be easy and safe. It is fine to only perform the check only if the using decl is a local decl.