--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/torture/pr85078.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,40 @@
+typedef __builtin_va_list a;
+
+class b
+{
+public:
+  virtual void c (int, const char *, a &);
+  char d;
+  void m_fn2 ()
+  {
+    a a;
+    c (2, &d, a);
+  }
+};
+
+class e:b
+{
+  virtual void f ()
+  {
+  }
+  void c (int, const char *, a &);
+};
+
+class g
+{
+protected:
+  b h;
+};
+
+class i:g
+{
+  int j ();
+};
+
+int
+i::j ()
+{
+  h.m_fn2 ();
+  return 0;
+}
+