gcc-4.9/gcc/testsuite/gcc.dg/pr40989.c


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/* { dg-do compile } */
/* { dg-options "-Werror=implicit" } */
int main() {
  return pippo(); /* { dg-error "" } */
}
/* { dg-message "warnings being treated as errors" "" { target *-*-* } 0 } */