[GHC] #7642: Nullary type classes

[GHC]

#7642: Nullary type classes
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    Reporter:  shachaf                  |       Owner:                  
        Type:  feature request          |      Status:  patch           
    Priority:  normal                   |   Milestone:                  
   Component:  Compiler (Type checker)  |     Version:  7.6.1           
    Keywords:                           |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple         |     Failure:  None/Unknown    
  Difficulty:  Unknown                  |    Testcase:                  
   Blockedby:                           |    Blocking:                  
     Related:                           |  
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Comment(by simonpj@…):

 commit 5319ea79fa1572b7d411548532031f9d19b928c6
 {{{
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Wed Mar 13 21:10:20 2013 +0000

     Implement nullary type classes (#7642)

     This is a slightly refined version of a patch by shachaf,
     done by Krzysztof Gogolewski <krz.gogolewski at gmail.com>.

  compiler/main/DynFlags.hs           |    2 +
  compiler/typecheck/TcTyClsDecls.lhs |   17 +-
  compiler/typecheck/TcValidity.lhs   | 2481
 ++++++++++++++++++-----------------
  docs/users_guide/flags.xml          |    6 +
  docs/users_guide/glasgow_exts.xml   |   29 +
  5 files changed, 1292 insertions(+), 1243 deletions(-)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7642#comment:9>
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