如果我修改覆盖范围的切片会怎样？

I recently noticed that I had done this:

for t, ts := range timespans {
    // remove current item
    if t+1 < len(timespans) {
        timespans = append(timespans[:t], timespans[t+1:]...)
    } else {
        timespans = timespans[:t]
    }

where

var timespans []TimeSpan

and

type TimeSpan [2]time.Time

How does range's work internally?

Does it work like a for i:=0; i<42; i++ loop (and skip items) or does it range over a copy of timespans, as it looked when the loop first started, or something else?

Just found the answer in the language specification.

The range expression is evaluated once before beginning the loop[...]`

So it operates on a copy. Awesome!

It works on a copy of the slice, you can modify the slice's data in place but it will ignore append and such.