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v/vlib/sync/channel_2_test.v

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const (
num_iterations = 10000
)
fn do_send(ch chan int) {
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for i in 0 .. num_iterations {
ch <- i
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}
}
fn test_channel_unbuffered() {
ch := chan int{}
go do_send(ch)
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mut sum := i64(0)
for _ in 0 .. num_iterations {
sum += <-ch
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}
assert sum == u64(num_iterations)*(num_iterations-1)/2
}