patch applied (ghc): fix #3822: desugaring case command in arrow notation

[Ross Paterson]

Tue Jun 15 15:51:10 PDT 2010  Ross Paterson <ross at soi.city.ac.uk>
  * fix #3822: desugaring case command in arrow notation
  
  Get the set of free variables from the generated case expression:
  includes variables in the guards and decls that were missed before,
  and is also a bit simpler.

    M ./compiler/deSugar/DsArrows.lhs -17 +11

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100615225110-b47d3-4413ef2c68e93c5080044d5baed3e95c6f97b488.gz