--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/torture/pr59226.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,27 @@
+// { dg-do compile }
+struct A
+{
+  virtual void foo() {}
+};
+
+struct B
+{
+  virtual void foo() {}
+};
+
+struct C : virtual A {};
+
+struct D : virtual A, B
+{
+  virtual void foo() {}
+};
+
+struct E : C, D
+{
+  virtual void foo() {}
+};
+
+void bar(A* p)
+{
+  p->foo();
+}