--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/ext/flexary32.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,19 @@
+/* { dg-do compile { target c++11 } } */
+/* { dg-options -Wno-pedantic } */
+
+struct str { int len; char s[]; };
+
+struct foo {
+  str x = {3, {1,2,3}}; /* { dg-error "(non-static)|(initialization)" } */
+  foo() {}
+};
+
+struct bar {
+  static constexpr str x = {3, {1,2,3}};
+  bar() {}
+};
+
+struct baz {
+  str x = {3};
+  baz() {}
+};