patch applied (ghc): Suppress knock-on typechecker errors

[Simon Peyton Jones]

Fri Oct  8 02:43:48 PDT 2010  simonpj at microsoft.com
  * Suppress knock-on typechecker errors
  
  The error cascade caused puzzling errors in T4093b, and
  suppressing some seems like a good plan.  Very few test
  outputs change.

    M ./compiler/typecheck/TcErrors.lhs -6 +17

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20101008094348-1287e-346635e22f43f82cf2d220ed112c3508770ad87d.gz