================
@@ -3058,6 +3058,133 @@ void Sema::NoteAllFoundTemplates(TemplateName Name) {
}
}
+static QualType commonTypeImpl(Sema &S, TemplateName BaseTemplate,
+ SourceLocation TemplateLoc,
+ ArrayRef<TemplateArgument> Ts) {
+ auto lookUpCommonType = [&](TemplateArgument T1,
+ TemplateArgument T2) -> QualType {
+ // Don't bother looking for other specializations if both types are
+ // builtins - users aren't allowed to specialize for them
----------------
cjdb wrote:
Can we diagnose the case where users do this, please? Similarly for
specialising `common_type<>`, `common_type<T>`, and `common_type<T1, T2, T3,
Ts...>`.
https://github.com/llvm/llvm-project/pull/99473
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