--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/torture/pr83471.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+
+class a {
+public:
+  void *operator new(__SIZE_TYPE__, int);
+};
+class b : public a {
+public:
+  b();
+  virtual void c() {}
+  void m_fn2();
+};
+int d;
+void e() {
+  long f;
+  b *g;
+  (f);
+  g = new (d) b;
+  g->c();
+  g->m_fn2();
+}