fn := func(x int, y float64) (y0Ret int, y1Ret float64) {
		return x + 1, y + 1.0
	}
	var args *stackArgs
	var regs abi.RegArgs
	intRegs := regs.Ints[:]
	floatRegs := regs.Floats[:]
	fval := float64(42.0)
	if len(intRegs) > 0 {
		intRegs[0] = 42
		floatRegs[0] = math.Float64bits(fval)
	} else {
		args = &stackArgs{
			x0: 42,
			x1: 42.0,
		}
	}