File: pointer-subtract-compat.c

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// RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic

typedef const char rchar;
int a(char* a, rchar* b) {
  return a-b;
}

// <rdar://problem/6520707> 
void f0(void (*fp)(void)) {
  int x = fp - fp; // expected-warning{{arithmetic on pointers to the function type 'void (void)' is a GNU extension}}
}