[GHC] #3670: Allow RULES for higher-ranked terms

[GHC]

#3670: Allow RULES for higher-ranked terms
------------------------------------------------+---------------------------
  Reporter:  rl                                 |          Owner:                  
      Type:  feature request                    |         Status:  closed          
  Priority:  normal                             |      Milestone:                  
 Component:  Compiler                           |        Version:  6.13            
Resolution:  fixed                              |       Keywords:                  
Difficulty:                                     |             Os:  Unknown/Multiple
  Testcase:  simplCore/should_compile/rule2.hs  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown                       |  
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Changes (by simonpj):

  * testcase:  => simplCore/should_compile/rule2.hs
  * difficulty:  =>
  * status:  new => closed
  * resolution:  => fixed
  * failure:  => None/Unknown

Comment:

 Good idea. Fixed by
 {{{
 Tue Nov 17 12:54:17 GMT 2009  simonpj at microsoft.com
   * Improvement to typecheck higher-rank rules better

   See Note [Typechecking rules] in TcRules.
   Suggested by Roman

     M ./compiler/typecheck/TcRules.lhs -5 +20
 }}}
 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3670#comment:1>
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