[GHC] #4361: Typechecker regression

[GHC]

#4361: Typechecker regression
---------------------------------------------+------------------------------
  Reporter:  igloo                           |          Owner:  simonpj         
      Type:  bug                             |         Status:  closed          
  Priority:  high                            |      Milestone:  7.0.1           
 Component:  Compiler (Type checker)         |        Version:  7.1             
Resolution:  fixed                           |       Keywords:                  
        Os:  Unknown/Multiple                |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown                    |     Difficulty:  Unknown         
  Testcase:  typecheck/should_compile/T4361  |      Blockedby:                  
  Blocking:                                  |        Related:                  
---------------------------------------------+------------------------------

Comment(by simonpj@…):

 commit f450d36a31d6687f338cb6a9590f8c2f689d79fe
 {{{
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Thu Jun 21 08:47:33 2012 +0100

     Remove the USAVOURY HACK in simplifyInfer

     See the discussion in Trac #4361.  The change fixes
     a regression in test IPRun.

  compiler/typecheck/TcSimplify.lhs |  104
 +++++++++++--------------------------
  1 files changed, 30 insertions(+), 74 deletions(-)
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4361#comment:4>
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