[GHC] #7071: Refactoring arrows

[GHC]

#7071: Refactoring arrows
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  Reporter:  simonpj           |          Owner:                  
      Type:  bug               |         Status:  closed          
  Priority:  normal            |      Milestone:                  
 Component:  Compiler          |        Version:  7.4.2           
Resolution:  fixed             |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
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Changes (by igloo):

  * status:  new => closed
  * resolution:  => fixed


Comment:

 I believe this was fixed by:

 commit ba56d20d767f0425f6f7515fa9c78b186589b896
 {{{
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Wed Oct 3 11:16:22 2012 +0100

     This big patch re-factors the way in which arrow-syntax is handled

     All the work was done by Dan Winograd-Cort.

     The main thing is that arrow comamnds now have their own
     data type HsCmd (defined in HsExpr).  Previously it was
     punned with the HsExpr type, which was jolly confusing,
     and made it hard to do anything arrow-specific.

     To make this work, we now parameterise
       * MatchGroup
       * Match
       * GRHSs, GRHS
       * StmtLR and friends
     over the "body", that is the kind of thing they
     enclose.  This "body" parameter can be instantiated to
     either LHsExpr or LHsCmd respectively.

     Everything else is really a knock-on effect; there should
     be no change (yet!) in behaviour.  But it should be a sounder
     basis for fixing bugs.
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7071#comment:6>
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