--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/torture/pr78268.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,25 @@
+// { dg-do compile }
+typedef enum {} nsresult;
+
+struct A {
+      virtual nsresult m_fn1(bool);
+};
+
+struct B {
+      A *operator[](int);
+};
+
+struct C {
+      nsresult m_fn2(bool);
+        bool m_fn3(bool);
+	  B mDataSources;
+};
+nsresult C::m_fn2(bool p1)
+{
+  m_fn3(!p1);
+}
+
+bool C::m_fn3(bool p1)
+{
+  mDataSources[0]->m_fn1(p1);
+}