#8073: TransformListComp weird type error ----------------------------------------------+---------------------------- Reporter: simonmar | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.8.1 Component: Compiler (Type checker) | Version: 7.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects valid program | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ----------------------------------------------+---------------------------- Comment (by simonmar): Ok, I guess that makes sense if we're typechecking the concrete syntax before desugaring. But I was using `MonadComprehensions`, and hence was looking at that section of the documentation which says {{{ [ x+y | x <- [1..10], y <- [1..x], then take 2 ] This translates to: do (x,y) <- take 2 (do x <- [1..10] y <- [1..x] return (x,y)) return (x+y) }}} So I found the behaviour quite surprising. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8073#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler