In select statement, reading from a closed channel is selected immediately without going to a default case.

go-unexpected-infinite-loop.go

package main

func main() {
	ch := make(chan struct{})
	close(ch)

	/*
		for _ = range ch {
		}
	*/
	for {
		select {
		case <-ch:
		default:
			return
		}
	}
}