go select syntax

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in this example:
Transclude of go-channel-select#go-select
look at for range 2
- without for loop, select will only be run once, and only 1 msg from 1 channel will be printed out.
if it’s more than range 2, say, if it’s range 3, it will cause go-deadlock!
why is this a deadlock?
- if select is looped 3 times, when it’s the third time, there’s no more value being sent to the channel
- hence the main thread will be always waiting (aka, being blocked!)
for range 2 simply means wait for two results:
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