[Haskell-cafe] Re: [Haskell] Top Level <-

[Ashley Yakeley]

Judah Jacobson wrote:
> I've been wondering: is there any benefit to having top-level ACIO'd
> <- instead of just using runOnce (or perhaps "oneshot") as the
> primitive for everything?

I don't think oneshots are very good for open witness declarations (such 
as the open exceptions I mentioned originally), since there are pure 
functions that do useful things with them.

Not sure about TVars either, which operate in the STM monad. Would you 
also need a oneshotSTM (or a class)?

-- 
Ashley Yakeley