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


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/* Regression test for proper error message.  The token name isn't
   NUL terminated, so we would print garbage after it.  */
/* { dg-do compile } */

#if 1 += 2   /* { dg-error "'\\+=' is not allowed" "+= in if" } */
syntax_error
#endif
int foo;