for range start:end:step optimization

[xushiwei]

Proposal

#865: for range start:end:step

	for range :10 {
		fmt.Println("Hi")
	}

Now it generates the following code:

	for _gop_it := builtin.NewRange__0(0, 10, 1).Gop_Enum(); ; {
		var _gop_ok bool
		_, _gop_ok = _gop_it.Next()
		if !_gop_ok {
			break
		}
		fmt.Println("Hi")
	}

It can be optimized to:

for i := 0; i < 10; i++ {
	fmt.Println("Hi")
}

Background

None

Workarounds

None