No longer assuming the number of prototype arguments is always less than the number of formal parameters for a variadic function call.

llvm-svn: 160570
diff --git a/clang/test/SemaCXX/member-operator-expr.cpp b/clang/test/SemaCXX/member-operator-expr.cpp
index ae5f8bb..c98ef73 100644
--- a/clang/test/SemaCXX/member-operator-expr.cpp
+++ b/clang/test/SemaCXX/member-operator-expr.cpp
@@ -27,3 +27,8 @@
   x->operator float(); // expected-error{{no member named 'operator float'}}
   x->operator; // expected-error{{expected a type}}
 }
+
+namespace pr13157 {
+  class A { public: void operator()(int x, int y = 2, ...) {} };
+  void f() { A()(1); }
+}
\ No newline at end of file