fix nttp

Author: Backl1ght

clang/lib/Sema/SemaTemplate.cpp

@@ -1664,10 +1664,7 @@ class ConstraintRefersToContainingTemplateChecker
   }
 
   void CheckNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
-    assert(D->getDepth() <= TemplateDepth &&
-           "Nothing should reference a value below the actual template depth, "
-           "depth is likely wrong");
-    if (D->getDepth() != TemplateDepth)
+    if (D->getDepth() < TemplateDepth)
       Result = true;
 
     // Necessary because the type of the NTTP might be what refers to the parent

clang/test/SemaTemplate/concepts-friends.cpp

@@ -517,6 +517,11 @@ struct S {
   friend void f2() requires requires { [](auto){}; } {
     return;
   }
+
+  template <typename U>
+  friend void f3() requires requires { []<int X>(){ return X; }; } {
+    return;
+  }
 };
 
 }