v/vlib/sync/channel_push_or_2_test.v

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const n = 1000
fn f(ch chan f64) {
mut s := 0.
for _ in 0 .. n {
s += <-ch
}
assert s == f64(n * (n + 1) / 2)
ch.close()
}
fn do_send(ch chan f64, val f64) ?f64 {
ch <- val ?
return val + 1.0
}
fn test_push_propargate() {
ch := chan f64{}
go f(ch)
mut s := 1.0
for {
s = do_send(ch, s) or { break }
}
assert s == f64(n + 1)
}