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diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-ts5.C b/gcc/testsuite/g++.dg/cpp2a/concepts-ts5.C
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+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-ts5.C
@@ -0,0 +1,10 @@
+// { dg-do compile { target c++2a } }
+// { dg-additional-options "-fconcepts-ts" }
+
+struct Base {
+ template<typename T>
+ static concept bool D() { return __is_same_as(T, int); } // { dg-error "a concept cannot be a member function" }
+
+ template<typename T, typename U>
+ static concept bool E() { return __is_same_as(T, U); } // { dg-error "a concept cannot be a member function" }
+};