patch applied (ghc): Make isIrrefutableHsPat say True for existentials; fixes Trac #4439

[Simon Peyton Jones]

Tue Oct 26 00:04:05 PDT 2010  simonpj at microsoft.com
  * Make isIrrefutableHsPat say True for existentials; fixes Trac #4439
  
  At last. A bug that is really easy to fix.

    M ./compiler/hsSyn/HsPat.lhs -1 +4

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20101026070405-1287e-968d930382df02ea59839ef48f139cdcf3ac91a4.gz