t.extra = underlying.extra
	t.width = underlying.width
	t.align = underlying.align
	t.alg = underlying.alg
	t.ptrBytes = underlying.ptrBytes
	t.intRegs = underlying.intRegs
	t.floatRegs = underlying.floatRegs
	t.underlying = underlying.underlying

	if underlying.NotInHeap() {
		t.SetNotInHeap(true)
	}
	if underlying.HasShape() {
		t.SetHasShape(true)
	}

		c, d *byte
	}

	type test struct {
		rcvr, typ                  Type
		size, argsize, retOffset   uintptr
		stack, gc, inRegs, outRegs []byte // pointer bitmap: 1 is pointer, 0 is scalar
		intRegs, floatRegs         int
		floatRegSize               uintptr
	}
	tests := []test{
		{
			typ:       ValueOf(func(a, b string) string { return "" }).Type(),
			size:      6 * goarch.PtrSize,