1  /* Test for constraints on constant expressions.  In C90 it is clear that
       2     certain constructs are not permitted in unevaluated parts of an
       3     expression (except in sizeof); in C99 it might fall within implementation
       4     latitude; and if the operands are suitable, diagnostics should not be
       5     issued.
       6  */
       7  /* Origin: Joseph Myers <jsm28@cam.ac.uk>; inspired by
       8     http://deja.com/getdoc.xp?AN=524271595&fmt=text by Peter Seebach.
       9  */
      10  /* { dg-do compile } */
      11  /* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
      12  
      13  /* The comma operator is in a subexpression that is not evaluated, so OK
      14     by C99.  In C90 a diagnostic is required since it is not in a sizeof.
      15  */
      16  int i = (1 ? 0 : (2, 3));