================
@@ -6308,11 +6308,11 @@ TypeResult Sema::ActOnTypeName(Declarator &D) {
     CheckExtraCXXDefaultArguments(D);
   }
 
-  if (const AutoType *AutoT = T->getAs<AutoType>())
-    CheckConstrainedAuto(
-        AutoT,
-        TInfo->getTypeLoc().getContainedAutoTypeLoc().getConceptNameLoc());
-
+  if (const AutoType *AutoT = T->getAs<AutoType>()) {
+    AutoTypeLoc Loc = TInfo->getTypeLoc().getContainedAutoTypeLoc();
+    CheckConstrainedAuto(AutoT,
+                         Loc ? Loc.getConceptNameLoc() : SourceLocation());
+  }
----------------
mizvekov wrote:

But my question was, what cases are we handling with this check in 
`ActOnTypeName`?
I thought 'auto' couldn't appear here.

https://github.com/llvm/llvm-project/pull/98622
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