--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/ipa/pr91969.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,38 @@
+/* PR ipa/91969 */
+/* { dg-options "-fdump-ipa-inline -O3" } */
+
+enum by
+{
+};
+class A
+{
+public:
+  class B
+  {
+  public:
+    virtual void m_fn2 (by) = 0;
+  };
+  virtual int m_fn1 ();
+  B *cf;
+};
+by a;
+class C : A, A::B
+{
+  void m_fn2 (by);
+};
+void C::m_fn2 (by) { cf->m_fn2 (a); }
+
+struct a
+{
+  virtual ~a ();
+};
+
+struct b
+{
+  virtual void d (...);
+};
+
+struct c : a, b
+{
+  void d (...) {}
+};