xxxMain = do
timeout <- getEnv "xxx_TIMEOUT"
case timeout of
Just str | [(t, _)] <- reads str -> do
addTimeout t (hPutStrLn stderr "*** TIMEOUT" >> _exit 1)
return ()
_ -> return ()
.......
What does the `|` mean in "Just str | [(t, _)] <- reads str" ?
Is it a logical `or` ?
Sincerely!
-----
fac n = let { f = foldr (*) 1 [1..n] } in f
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