patch applied (ghc): Fix a long-standing latent bug (and the build): check res_ty not sig_ty

[Simon Peyton Jones]

Wed Mar  4 01:19:13 PST 2009  simonpj at microsoft.com
  * Fix a long-standing latent bug (and the build): check res_ty not sig_ty
  Ignore-this: 3494ed3f342b63840eef791a5200695

    M ./compiler/typecheck/TcForeign.lhs -4 +6

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20090304091913-1287e-cfee388537632f03ea094c783cd2cbe3c6d67512.gz