[Haskell-beginners] newEmptyMVar return type

[Velichko Lefterov]

OK,
I tried this one:

test:: IO (Maybe a)
test = return Nothing

It looks similar and it seems to work...

On Tue, Jan 5, 2021 at 8:22 PM Velichko Lefterov <
velichko.lefterov at gmail.com> wrote:

> Hello,
> could someone explain me simple how return-type polymorphism works
> in the following case:
> newEmptyMVar :: IO (MVar a) ?
>
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