patch applied (ghc-7.0/ghc): Fix small but egregious error: using un-zonked constraints in simplifyRule

[Ian Lynagh]

Fri Feb 11 09:38:35 PST 2011  simonpj at microsoft.com
  * Fix small but egregious error: using un-zonked constraints in simplifyRule
  
  This resulted in double unifications.  Fix is trivial.

    M ./compiler/typecheck/TcSimplify.lhs -1 +1

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc-7.0/ghc;a=darcs_commitdiff;h=20110211173835-1287e-6296103b0ca305b9d0ce013df388fed15b0396b2.gz