thenIO removal

[David Feuer]

Simon Peyton Jones wrote:

>
> It's not a big deal.
>
> You can probably replace both those bindIOName uses with bindMName (i.e
> (>>=)), in TcRnDriver.  That will just make GHCi generate code with uses of
> overloaded (>>=) that must be evaluated, rather than calling bindIO
> directly.  It should work just fine, but it'll make everything a tiny bit
> slower and more indirect.  If it simplified the code a lot, then fine, but
> it doesn't really.  So I'm inclined to leave it.
>

That's fine; I don't know why my search didn't turn that up (perhaps it's
referenced in some weird indirect way). If we're going to keep thenIO, we
should surely define (*>) = (>>) = thenIO, right?
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