1 files changed, 49 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/concepts/generic-fn-err.C b/gcc/testsuite/g++.dg/concepts/generic-fn-err.C
new file mode 100644
index 00000000000..c6b74571954
--- /dev/null
+++ b/gcc/testsuite/g++.dg/concepts/generic-fn-err.C
@@ -0,0 +1,49 @@
+// { dg-options "-std=c++1z" }
+
+template<typename T>
+  concept bool C() { return __is_class(T); }
+
+template<int N>
+  concept bool Int() { return true; }
+
+template<template<typename> class X>
+  concept bool Template() { return true; }
+
+struct S { };
+
+void f1(Int) { }      // { dg-error "invalid" }
+void f2(Template) { } // { dg-error "invalid" }
+
+struct S1 {
+  void f1(auto x) { }
+  void f2(C x) { }
+
+  void f3(auto x) { }
+  void f3(C x) { }
+};
+
+template<C T>
+  struct S2 {
+    void f1(auto x) { }
+    void f2(C x) { }
+
+    void h1(auto x);
+    void h2(C x);
+
+    template<C U>
+      void g(T t, U u) { }
+  };
+
+int main() {
+  S s;
+
+  S1 s1;
+  s1.f2(0); // { dg-error "matching" }
+
+  S2<S> s2;
+  s2.f2(0); // { dg-error "matching" }
+  s2.h2(0); // { dg-error "matching" }
+
+  s2.g(s, 0); // { dg-error "matching" }
+  s2.g(0, s); // { dg-error "matching" }
+}