1  /* Test static assertions.  Omitting the string should not result in a
       2     duplicate diagnostic in pre-C11 modes.  */
       3  /* { dg-do compile } */
       4  /* { dg-options "-std=c99 -pedantic" } */
       5  
       6  _Static_assert (1); /* { dg-warning "ISO C99 does not support '_Static_assert'" } */