Hi,

Sequence expressions without a 'seq' prefix are deprecated (because of ambiguity with workflows syntax).

The backpipe operator is defined like this:

1

let inline (<|) f x = f x

So, it does "nothing" but it has a quite low precedence. It's sometimes used to remove parenthesis:

1
2
3
4
5

printfn "1 + 1 = %d" <| 1 + 1

Array.init 10 <| fun x ->
    if x < 5 then 0
    else x

You might also be interested by this discussion: [link:cs.hubfs.net] (now, I fully agree that the associativity change should be done).