#4370: Bring back monad comprehensions
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Reporter: simonpj | Owner: nsch
Type: feature request | Status: closed
Priority: normal | Milestone: 7.4.1
Component: Compiler | Version: 6.12.3
Resolution: fixed | Keywords:
Testcase: | Blockedby:
Difficulty: | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: None/Unknown |
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Comment(by nsch):
The userguide looks fine, I have just one more question. Last time I
checked "MonadComprehensions" didn't allow transform or parallel
statements by default. Did you change that on purpose or did I forgot to
test that properly before sending in those patches?
{{{
GHCi, version 7.1.20110504: http://www.haskell.org/ghc/ :? for help
Prelude> :set -XMonadComprehensions
Prelude> [ x | x <- [1..], then take 5 ]
<interactive>:0:19:
Unexpected transform statement in a monad comprehension
Use -XTransformListComp
Prelude> [ x+y | x <- [1,2] | y <- [1,2] ]
<interactive>:0:18:
Unexpected parallel statement in a monad comprehension
Use -XParallelListComp
}}}
Those errors shouldn't occur…
I currently cannot get the latest version to see whether or not this is
already fixed (my local git is messed up somehow), but I guess it's not.
:)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4370#comment:58>
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