patch applied (ghc): Fix Trac #T4136: take care with nullary symbol constructors

[Simon Peyton Jones]

Wed Jul  7 06:59:45 PDT 2010  simonpj at microsoft.com
  * Fix Trac #T4136: take care with nullary symbol constructors
  
  When a nullary constructor is a symbol eg (:=:) we need
  to take care.  Annoying.

    M ./compiler/typecheck/TcGenDeriv.lhs -5 +14

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100707135945-1287e-82041eeb6d6e365b956bce940c6199f2132817d3.gz