1 files changed, 11 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/ext/attrib25.C b/gcc/testsuite/g++.dg/ext/attrib25.C
new file mode 100644
index 000000000..aeffdffe3
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/attrib25.C
@@ -0,0 +1,11 @@
+// PR c++/28559
+
+template<typename T> struct A
+{
+  struct B;
+};
+
+struct C
+{
+  template<typename T> friend struct __attribute__((packed)) A<T>::B; // { dg-warning "uninstantiated" }
+};