================
@@ -5751,14 +5751,16 @@ void Sema::InstantiateFunctionDefinition(SourceLocation 
PointOfInstantiation,
     RebuildTypeSourceInfoForDefaultSpecialMembers();
     SetDeclDefaulted(Function, PatternDecl->getLocation());
   } else {
-    NamedDecl *ND = Function;
-    DeclContext *DC = ND->getLexicalDeclContext();
+    DeclContext *DC = Function->getLexicalDeclContext();
     std::optional<ArrayRef<TemplateArgument>> Innermost;
-    if (auto *Primary = Function->getPrimaryTemplate();
-        Primary &&
+    bool NeedDCFromPrimaryTemplate =
         !isGenericLambdaCallOperatorOrStaticInvokerSpecialization(Function) &&
         Function->getTemplateSpecializationKind() !=
-            TSK_ExplicitSpecialization) {
+            TSK_ExplicitSpecialization &&
+        !PatternDecl->getDependentSpecializationInfo();
----------------
zyn0217 wrote:

I am also considering to have these instantiations 1) never track the primary 
template in these cases 2) or track the invalid explicit specialization as its 
primary template (this likely isn't doable because the specialization is not a 
template).

Neither option seems ideal to me

https://github.com/llvm/llvm-project/pull/139436
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