[GHC] #7079: Irrefutable pattern failed for pattern Data.Maybe.Just

[GHC]

#7079: Irrefutable pattern failed for pattern Data.Maybe.Just
-------------------------------+--------------------------------------------
  Reporter:  lbolla            |          Owner:                  
      Type:  bug               |         Status:  closed          
  Priority:  normal            |      Milestone:                  
 Component:  Compiler          |        Version:  7.4.2           
Resolution:  duplicate         |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------
Changes (by simonpj):

  * status:  new => closed
  * difficulty:  => Unknown
  * resolution:  => duplicate


Comment:

 Thanks!  I got this
 {{{
 T7079.hs:10:28: parse error on input `∘'
 }}}
 even when I added `LANGUAGE UnicodeSyntax`.

 When I used an ordinary period, happily in HEAD it now fails gracefully
 {{{
 T7079.hs:11:10:
     Malformed instance: Ord a => forall a. Set (UnbalancedSet a)
 }}}
 So it's another instance of #5951, which is fixed.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7079#comment:1>
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