gcc/testsuite/gcc.dg/gnu23-auto-1.c

   1 /* Test C23 auto.  Invalid code with GNU extensions.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-std=gnu23" } */
   4
   5 void
   6 f ()
   7 {
   8   /* Do not allow a non-definition declaration of a tag in the auto
   9      initializer, to avoid it escaping an inner scope as shown here.  */
  10   auto x = ({ struct s; struct s *x = 0; x; }); /* { dg-error "declared in underspecified object initializer" } */
  11 }