1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/template/pr66686.C b/gcc/testsuite/g++.dg/template/pr66686.C
new file mode 100644
index 00000000000..d8aea625d46
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/pr66686.C
@@ -0,0 +1,15 @@
+// PR c++/66686
+
+template <int>
+struct Y { };
+
+template <class B, template <template <B> class Z> class C>
+struct X
+{
+  C<Y> a;  // { dg-bogus "mismatch" }
+};
+
+template <template <int> class>
+struct A { };
+
+X<int, A> a;