llvm-gcc-4.2/gcc/testsuite/gcc.dg/label-decl-1.c

/* Test diagnostics for label declarations.  Test with no special
   options.  */
/* Origin: Joseph Myers <joseph@codesourcery.com> */
/* { dg-do compile } */
/* { dg-options "" } */

typedef int b;

void
f (void)
{
  __label__ a, b, c, d;
  __extension__ (void)&&d; /* { dg-error "error: label 'd' used but not defined" } */
  goto c; /* { dg-error "error: label 'c' used but not defined" } */
 a: (void)0;
 b: (void)0;
}