patch applied (ghc): Less voluminous error when derived code doesn't typecheck

[Simon Peyton Jones]

Wed Sep 15 00:23:01 PDT 2010  simonpj at microsoft.com
  * Less voluminous error when derived code doesn't typecheck

    M ./compiler/typecheck/TcInstDcls.lhs -8 +12

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100915072301-1287e-2c8bead73c6eabe70cccbf8a3b238f56c09a75e2.gz