patch applied (ghc): Make rebindable if-then-else a little more permissive

[Simon Peyton Jones]

Thu Dec  2 04:25:40 PST 2010  simonpj at microsoft.com
  * Make rebindable if-then-else a little more permissive
  
  See Note [Rebindable syntax for if].  Fixes Trac #4798.
  Thanks to Nils Schweinsberg <mail at n-sch.de>

    M ./compiler/typecheck/TcExpr.lhs -6 +28

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20101202122540-1287e-5dfc851c53884eded2394d893185b882ff9abd0c.gz