llvm-gcc-4.0/gcc/testsuite/treelang/compile/var_defs.tree

// { dg-do compile }
// { dg-options "-Wuninitialized -O" }
external_definition void boring (int arg0);
external_definition char condition (char arg1, char arg2);
external_definition int first_nonzero (int arg5, int arg6);

boring
{
  arg0 = +5  + +3;  // Force 3 and 5 to be signed numbers.
  arg0 = arg0 + +3;
}

condition
{
  if (arg1)
    {
      automatic int i;
      return i + 1; // { dg-warning "uninitialized" }
    }
  else
    {
      automatic int j;
      return j; // { dg-warning "uninitialized" }
    }
}

first_nonzero
{
  automatic int y;
  automatic int y;  // { dg-error "Duplicate" }
  if (arg5)
    {
      return arg5;
    }
  else
    {
      automatic int j;
      j = arg6;
      return j;
    }
  return arg6;
}