Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: Pugs (user goal)
rejecting: Pugs-6.2.13.20150815, Pugs-6.2.13.20130611, Pugs-6.2.13.20120717,
Pugs-6.2.13.20120203, Pugs-6.2.13.20111008, Pugs-6.2.13.20110925,
Pugs-6.2.13.20110519, Pugs-6.2.13.16, Pugs-6.2.13.15, Pugs-6.2.13.14,
Pugs-6.2.13.13, Pugs-6.2.13.12, Pugs-6.2.13.11, Pugs-6.2.13.10, Pugs-6.2.13.9,
Pugs-6.2.13.8, Pugs-6.2.13.7, Pugs-6.2.13.6, Pugs-6.2.13.5 (constraint from
user target requires ==6.2.13.4)
trying: Pugs-6.2.13.4
trying: base-4.9.0.0/installed-4.9... (dependency of Pugs-6.2.13.4)
trying: directory-1.2.6.2/installed-1.2... (dependency of Pugs-6.2.13.4)
next goal: haskell98 (dependency of Pugs-6.2.13.4)
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.