[GHC] #5141: syntax error in pretty-printed kind ascriptions

[GHC]

#5141: syntax error in pretty-printed kind ascriptions
------------------------------------------------+---------------------------
  Reporter:  megacz                             |          Owner:                  
      Type:  bug                                |         Status:  closed          
  Priority:  normal                             |      Milestone:                  
 Component:  Compiler                           |        Version:  7.0.3           
Resolution:  fixed                              |       Keywords:                  
  Testcase:                                     |      Blockedby:                  
Difficulty:                                     |             Os:  Unknown/Multiple
  Blocking:                                     |   Architecture:  Unknown/Multiple
   Failure:  Incorrect warning at compile-time  |  
------------------------------------------------+---------------------------

Comment(by megacz):

 I like Sebastian's example too (I have been considering rewriting
 GArrow.hs using (~>) for a while now).

 Are "tycon symols" usable as datacons too?  I'm a bit fuzzy on how the
 namespaces work; GHC's NameSpace.lhs considers the datacon namespace to be
 disjoint from the tycon namespace, and also considers the tyvar namespace
 to be disjoint from the variable-name namespace.  But most users seem to
 think of "the capitalized-word namespace" and "the uncapitalized-word
 namespace".

 I ask because it would be nice to be able to use symbols as associated
 types:

 {{{
 class Category g => GArrow g where
   data (**) :: * -> * -> *
   -- ...
 }}}

 So would -XSymbolsAreTyCons (or whatever it will be called) allow the
 program above?

 Thanks,

   - a

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5141#comment:5>
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