state := newDecodeState(b)
	state.fieldnum = -1
	return state
}

// Test instruction execution for decoding.
// Do not run the machine yet; instead do individual instructions crafted by hand.
func TestScalarDecInstructions(t *testing.T) {
	ovfl := errors.New("overflow")

	// bool
	{
		var data bool
		instr := &decInstr{decBool, 6, nil, ovfl}
		state := newDecodeStateFromData(boolResult)