1 files changed, 12 insertions, 0 deletions
diff --git a/clang/test/SemaTemplate/concepts.cpp b/clang/test/SemaTemplate/concepts.cpp
index 3124693..f335ca3b 100644
--- a/clang/test/SemaTemplate/concepts.cpp
+++ b/clang/test/SemaTemplate/concepts.cpp
@@ -1165,3 +1165,15 @@ concept C = invalid; // expected-error {{use of undeclared identifier 'invalid'}
 bool val2 = C<int>;
 
 } // namespace GH109780
+
+namespace GH121980 {
+
+template <class>
+concept has_member_difference_type; // expected-error {{expected '='}}
+
+template <has_member_difference_type> struct incrementable_traits; // expected-note {{declared here}}
+
+template <has_member_difference_type Tp>
+struct incrementable_traits<Tp>; // expected-error {{not more specialized than the primary}}
+
+}