[GHC] #864: -fgenerics bug

[GHC]

#864: -fgenerics bug
-----------------------+----------------------------------------------------
  Reporter:  guest     |          Owner:         
      Type:  bug       |         Status:  closed 
  Priority:  normal    |      Milestone:         
 Component:  Compiler  |        Version:  6.4.2  
  Severity:  normal    |     Resolution:  fixed  
  Keywords:            |             Os:  MacOS X
Difficulty:  Unknown   |   Architecture:  powerpc
-----------------------+----------------------------------------------------
Changes (by simonpj):

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

Comment:

 Good point.  The derivable-type-class mechanism isn't capable of handling
 higher-rank method types, I'm afraid.  (And much else besides!)  Sorry.

 I've fixed the compiler so that it fails more gracefully; crashing is
 definitely a bug.

 Thanks for pointing this out.

 Test is tcfail163.hs

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/864>
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