fmt.Printf("RHS didn't panic, case f%d\n", i)
		}()
		if len(m) != 0 {
			fmt.Printf("map insert happened, case f%d\n", i)
		}
	}

	// Append slice.
	for i, f := range []func(map[int][]int){
		fa0, fa1, fa2, fa3,
	} {
		m := map[int][]int{}
		func() { // wrapper to scope the defer.
			defer func() {
				recover()
			}()
			f(m) // Will panic. Shouldn't modify m.
			fmt.Printf("RHS didn't panic, case fa%d\n", i)

	register["FT5"] = riscv.REG_FT5
	register["FT6"] = riscv.REG_FT6
	register["FT7"] = riscv.REG_FT7
	register["FS0"] = riscv.REG_FS0
	register["FS1"] = riscv.REG_FS1
	register["FA0"] = riscv.REG_FA0
	register["FA1"] = riscv.REG_FA1
	register["FA2"] = riscv.REG_FA2
	register["FA3"] = riscv.REG_FA3
	register["FA4"] = riscv.REG_FA4
	register["FA5"] = riscv.REG_FA5
	register["FA6"] = riscv.REG_FA6
	register["FA7"] = riscv.REG_FA7