Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: hack-contrib (user goal)
rejecting: hack-contrib-2010.9.28, hack-contrib-2010.2.25,
hack-contrib-2010.1.26, hack-contrib-2010.1.24, hack-contrib-2009.12.20,
hack-contrib-2009.11.1, hack-contrib-2009.8.18, hack-contrib-2009.8.16,
hack-contrib-2009.7.3, hack-contrib-2009.6.25, hack-contrib-2009.6.9,
hack-contrib-2009.5.19 (constraint from user target requires ==2009.5.13)
trying: hack-contrib-2009.5.13
trying: base-4.9.0.0/installed-4.9... (dependency of hack-contrib-2009.5.13)
trying: directory-1.2.6.2/installed-1.2... (dependency of
hack-contrib-2009.5.13)
next goal: haskell98 (dependency of hack-contrib-2009.5.13)
rejecting: haskell98-2.0.0.3 (conflict: base==4.9.0.0/installed-4.9...,
haskell98 => base>=4.7 && <4.8)
rejecting: haskell98-2.0.0.2 (conflict: base==4.9.0.0/installed-4.9...,
haskell98 => base==4.6.*)
rejecting: haskell98-2.0.0.1, haskell98-2.0.0.0 (conflict:
directory==1.2.6.2/installed-1.2..., haskell98 => directory>=1.1 && <1.2)
rejecting: haskell98-1.1.0.1, haskell98-1.1.0.0, haskell98-1.0.1.1 (conflict:
base==4.9.0.0/installed-4.9..., haskell98 => base>=3 && <4.6)
rejecting: haskell98-1.0.1.0 (conflict: base==4.9.0.0/installed-4.9...,
haskell98 => base<4.6)
rejecting: haskell98-1.0 (conflict: base==4.9.0.0/installed-4.9..., haskell98
=> base<4.3)
Dependency tree exhaustively searched.