--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/torture/pr64378.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,24 @@
+// { dg-do compile }
+// { dg-options "-fno-ipa-cp" }
+struct data {
+  data(int) {}
+};
+
+struct top {
+  virtual int topf() {}
+};
+
+struct child1: top {
+    void childf()
+    {
+        data d(topf());
+    }
+};
+
+void test(top *t)
+{
+    child1 *c = static_cast<child1 *>(t);
+    c->childf();
+    child1 d;
+    test(&d);
+}