o3 := uint32(0xe5900000 | 12<<12 | 12<<16)      // MOVW (R12), R12
	o4 := uint32(0xe12fff10 | 12)                   // JMP  (R12)
	o5 := uint32(0)                                 // WORD $target@GOT // filled in with relocation
	o6 := uint32(0)
	if offset != 0 {
		// insert an instruction to add offset
		tramp.SetSize(24) // 6 instructions
		o6 = o5
		o5 = o4

	check(o1, "o1", "c1k1", "", "")

	o2 := WithValue(o1, k2, "o2k2")
	check(o2, "o2", "c1k1", "o2k2", "")

	o3 := otherContext{c4}
	check(o3, "o3", "", "c2k2", "c3k3")

	o4 := WithValue(o3, k3, nil)
	check(o4, "o4", "", "c2k2", "")
}

func TestAllocs(t *testing.T) {
	bg := Background()
	for _, test := range []struct {
		desc       string
		f          func()
		limit      float64

		t.Error("wrong underflow error for int32:", err)
	}

	// uint8
	b.Reset()
	it = inputT{
		Maxu: math.MaxUint8 + 1,
	}
	type outu8 struct {
		Maxu uint8
	}
	var o4 outu8
	enc.Encode(it)
	err = dec.Decode(&o4)
	if err == nil || err.Error() != `value for "Maxu" out of range` {
		t.Error("wrong overflow error for uint8:", err)
	}

	// uint16
	b.Reset()
	it = inputT{

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