================
@@ -7894,13 +7895,18 @@ bool 
Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD,
   if (ShouldDeleteForTypeMismatch || ShouldDeleteSpecialMember(MD, CSM)) {
     if (First) {
       SetDeclDeleted(MD, MD->getLocation());
-      if (!inTemplateInstantiation() && !HadError) {
-        Diag(MD->getLocation(), diag::warn_defaulted_method_deleted) << CSM;
+      if ((ForDefinition || !inTemplateInstantiation()) && !HadError) {
+        // Always error if we're about to generate a definition.
+        HadError = ForDefinition;
----------------
Sirraide wrote:

> I think the bisect as suggested by others to see if we can figure out what 
> the difference is for the cause is a better way forward than this

That makes sense. I’ll take another look at this.

https://github.com/llvm/llvm-project/pull/80959
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