================
@@ -3139,6 +3139,19 @@ Parser::DeclGroupPtrTy
Parser::ParseCXXClassMemberDeclaration(
return Actions.BuildDeclaratorGroup(Decls);
}
+ // Befriending a concept is invalid and would already fail if
+ // we did nothing here, but this allows us to issue a more
+ // helpful diagnostic.
+ if (Tok.is(tok::kw_concept)) {
----------------
Sirraide wrote:
> Could we get a standard reference for a befriending a concept being invalid.
Pretty sure the syntax just doesn’t allow for it: Neither a
`simple-type-specifier`, nor an `elaborated-type-specifier`, nor a
`typename-specifier` can start with `concept`. The grammatical productions for
`friend-type-specifier` are already listed in the comment at the top of the
function.
https://github.com/llvm/llvm-project/pull/105121
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