> Hello World!
>
> Can anyone answer my silly question: what does "let () = bla" really mean?

let () = bla is equivalent to writing bla; but is opening a block if
followed by an 'in'.

Here are the different forms :

bla; (* warning if partial application or if returned type not unit *)
ignore(bla); (* warning if partial application, ignore returned type *)
let () = bla (* error if partial application or if returned type not unit *)
let _ = bla (* no warning or errors !! be careful if you want to use it *)

Regards,
Nicolas Cannasse

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