re PR c++/89871 (Wall + designated initializers)

	PR c++/89871
	* g++.dg/cpp2a/desig14.C: New test.

From-SVN: r270019

gcc/testsuite/ChangeLog

+2019-03-29  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/89871
+	* g++.dg/cpp2a/desig14.C: New test.
+
 2019-03-29  Martin Liska  <mliska@suse.cz>
 
 	* gcc.dg/ipa/ipa-icf-39.c: Prine '***dbgcnt' output.

gcc/testsuite/g++.dg/cpp2a/desig14.C

+// PR c++/89871
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wall" }
+
+struct A {};
+struct B {};
+
+struct S {
+  union {
+    A a;
+    B b;
+  };
+};
+
+int main() {
+  S s;
+  s = S{.a = A{}};
+}