1// RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic
2
3typedef const char rchar;
4int a(char* a, rchar* b) {
5  return a-b;
6}
7
8// <rdar://problem/6520707>
9void f0(void (*fp)(void)) {
10  int x = fp - fp; // expected-warning{{arithmetic on pointers to the function type 'void (void)' is a GNU extension}}
11}
12