}

func (p *parser) want(tok token) {
	if !p.got(tok) {
		p.syntaxError("expected " + tokstring(tok))
		p.advance()
	}
}

// gotAssign is like got(_Assign) but it also accepts ":="
// (and reports an error) for better parser error recovery.
func (p *parser) gotAssign() bool {
	switch p.tok {
	case _Define:
		p.syntaxError("expected =")
		fallthrough
	case _Assign:
		p.next()
		return true
	}