/*
 *  call-seq:
 *     token.start = start -> integer
 *
 *  Set start byte-position of this token
 */
static VALUE
frt_token_set_start_offset(VALUE self, VALUE rstart)
{
    RToken *token;
    GET_TK(token, self);
    token->start = FIX2INT(rstart);
    return rstart;
}