hash.c:429
static int
shift_i(key, value, var)
    VALUE key, value;
    struct shift_var *var;
{
    if (key == Qundef) return ST_CONTINUE;
    if (var->stop) return ST_STOP;
    var->stop = 1;
    var->key = key;
    var->val = value;
    return ST_DELETE;
}
