1/* Regression test: #ifdef 0 should not crash.  Problem noted by
2   Jakub Jelinek <jakub@redhat.com>.  */
3/* { dg-do preprocess } */
4
5#ifdef 0  /* { dg-error "macro names" } */
6#endif
7
8#ifndef 0  /* { dg-error "macro names" } */
9#endif
10