#4370: Bring back monad comprehensions
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Reporter: simonpj | Owner: nsch
Type: feature request | Status: new
Priority: normal | Milestone: 7.2.1
Component: Compiler | Version: 6.12.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by simonpj):
I think what you want the type checker to do is to give you a term,
attached to the `GroupStmt` of type
{{{
imap :: forall a b. (a->b) -> m a -> m b
}}}
where `m` is the type of the monad. Then you can instantiate this `imap`
in the desugarer, with explicit applications, just as is done with plain
`map` now.
So the type checker need only produce '''one''' term, with the above type.
That should not be hard.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4370#comment:32>
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