1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/template/defarg19.C b/gcc/testsuite/g++.dg/template/defarg19.C
new file mode 100644
index 00000000000..856980232f4
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/defarg19.C
@@ -0,0 +1,15 @@
+// PR c++/53856
+
+template<typename T>
+struct A
+{
+  struct B;
+};
+
+template<typename T = int>
+struct A<T>::B  // { dg-error "default argument" }
+{
+  int i;
+};
+
+A<int>::B b = { };