[FOLD] TransformOverloadExprDecls filters template names

Author: sdkrystian

clang/lib/Sema/SemaExprMember.cpp

@@ -1015,8 +1015,7 @@ Sema::BuildMemberReferenceExpr(Expr *BaseExpr, QualType BaseExprType,
                                ActOnMemberAccessExtraArgs *ExtraArgs) {
 
   if (R.wasNotFoundInCurrentInstantiation() ||
-      (SS.isValid() && !computeDeclContext(SS, false)) ||
-      (R.isUnresolvableResult() && R.isClassLookup() && R.getNamingClass()->isDependentContext())) {
+      (SS.isValid() && !computeDeclContext(SS, false))) {
     return ActOnDependentMemberExpr(BaseExpr, BaseExprType,
                                     IsArrow, OpLoc,
                                     SS, TemplateKWLoc, FirstQualifierInScope,

clang/lib/Sema/TreeTransform.h

@@ -12938,6 +12938,26 @@ bool TreeTransform<Derived>::TransformOverloadExprDecls(OverloadExpr *Old,
   // Resolve a kind, but don't do any further analysis.  If it's
   // ambiguous, the callee needs to deal with it.
   R.resolveKind();
+
+  if (Old->hasTemplateKeyword() && !R.empty()) {
+    NamedDecl *FoundDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
+    getSema().FilterAcceptableTemplateNames(R,
+                                            /*AllowFunctionTemplates=*/true,
+                                            /*AllowDependent=*/true);
+    if (R.empty()) {
+      // If a 'template' keyword was used, a lookup that finds only non-template
+      // names is an error.
+      getSema().Diag(R.getNameLoc(), diag::err_template_kw_refers_to_non_template)
+          << R.getLookupName()
+          << Old->getQualifierLoc().getSourceRange()
+          << Old->hasTemplateKeyword()
+          << Old->getTemplateKeywordLoc();
+      getSema().Diag(FoundDecl->getLocation(), diag::note_template_kw_refers_to_non_template)
+          << R.getLookupName();
+        return true;
+    }
+  }
+
   return false;
 }