func (g *Gen) synError(pos *tok.Token, op string) {
e := comperr.New(pos, fmt.Errorf("syntax error for %s", op))
g.errors = append(g.errors, e)
}
// err appends an error onto the error list
func (p *Parser) err(s string) {
e := comperr.New(p.cur(), errors.New(s))
p.errors = append(p.errors, e)
}
func (self *Gen) errorf(t *tok.Token, f string, args ...interface{}) {
e := comperr.New(t, fmt.Errorf(f, args...))
self.errors = append(self.errors, e)
}
