PR5520: Make sure to check whether the base type is complete before looking for
operator->.

llvm-svn: 89180
diff --git a/clang/test/SemaCXX/arrow-operator.cpp b/clang/test/SemaCXX/arrow-operator.cpp
index a226495..08b3cd4 100644
--- a/clang/test/SemaCXX/arrow-operator.cpp
+++ b/clang/test/SemaCXX/arrow-operator.cpp
@@ -16,7 +16,10 @@
 
 struct D : A { };
 
-void f(C &c, D& d) {
+struct E; // expected-note {{forward declaration of 'struct E'}}
+
+void f(C &c, D& d, E& e) {
   c->f(); // expected-error{{use of overloaded operator '->' is ambiguous}}
   d->f();
+  e->f(); // expected-error{{incomplete definition of type}}
 }