// so we don't know how they correspond to Go fields
			// even if they are aligned at byte boundaries.
			continue
		}

		if talign > 0 && f.ByteOffset%talign != 0 {
			// Drop misaligned fields, the same way we drop integer bit fields.
			// The goal is to make available what can be made available.
			// Otherwise one bad and unneeded field in an otherwise okay struct

	if string(m) != expect {
		t.Errorf("rot13: expected %q got %q", expect, m)
	}

	// 5. Drop
	dropNotLatin := func(r rune) rune {
		if unicode.Is(unicode.Latin, r) {
			return r
		}
		return -1
	}
	m = Map(dropNotLatin, []byte("Hello, 세계"))
	expect = "Hello"
	if string(m) != expect {
		t.Errorf("drop: expected %q got %q", expect, m)
	}

	// 6. Invalid rune

	MOVD SPR(3), 4(R1)              // 7fe302a6fbe10004
	MOVD XER, 4(R1)                 // 7fe102a6fbe10004
	MOVD 4(R1), SPR(3)              // ebe100047fe303a6
	MOVD 4(R1), XER                 // ebe100047fe103a6
	PNOP                            // 0700000000000000

	SETB CR1,R3                     // 7c640100
	VCLZLSBB V1,R2                  // 10400e02
	VCTZLSBB V1,R2                  // 10410e02