if skip(ap) {
		return nil
	}
	args := make([]AST, len(ap.Args))
	changed := false
	for i, a := range ap.Args {
		ac := a.Copy(fn, skip)
		if ac == nil {
			args[i] = a
		} else {
			args[i] = ac
			changed = true
		}
	}
	if !changed {
		return fn(ap)
	}
	ap = &ArgumentPack{Args: args}
	if r := fn(ap); r != nil {
		return r
	}
	return ap
}

s3.cn-north-1.amazonaws.com.cn
s3.dualstack.ap-northeast-1.amazonaws.com
s3.dualstack.ap-northeast-2.amazonaws.com
s3.ap-northeast-2.amazonaws.com
s3-website.ap-northeast-2.amazonaws.com
s3.dualstack.ap-south-1.amazonaws.com
s3.ap-south-1.amazonaws.com
s3-website.ap-south-1.amazonaws.com
s3.dualstack.ap-southeast-1.amazonaws.com
s3.dualstack.ap-southeast-2.amazonaws.com

	"Å":                           "\u00c5",
	"⍼":                         "\u237c",
	"ą":                           "\u0105",
	"𝕒":                            "\U0001d552",
	"≈":                              "\u2248",
	"⩰":                             "\u2a70",
	"⩯":                          "\u2a6f",
	"≊":                             "\u224a",

		a1 = c.aclass(&p.From) + 1
		p.From.Class = int8(a1)
	}
	a1--

	argsv := [3]int{C_NONE + 1, C_NONE + 1, C_NONE + 1}
	for i, ap := range p.RestArgs {
		argsv[i] = int(ap.Addr.Class)
		if argsv[i] == 0 {
			argsv[i] = c.aclass(&ap.Addr) + 1
			ap.Addr.Class = int8(argsv[i])
		}

	}
	a3 := argsv[0] - 1
	a4 := argsv[1] - 1
	a5 := argsv[2] - 1

	a6 := int(p.To.Class)