gcc/testsuite/gcc.dg/cpp/if-4.c

   1 /* Regression test for proper error message.  The token name isn't
   2    NUL terminated, so we would print garbage after it.  */
   3 /* { dg-do compile } */
   4
   5 #if 1 += 2   /* { dg-error "'\\+=' is not valid" "+= in if" } */
   6 syntax_error
   7 #endif
   8 int foo;