Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: hat (user goal)
rejecting: hat-2.9.0.0, 2.8.0.0, 2.7.0.12, 2.7.0.11, 2.7.0.10, 2.7.0.9,
2.7.0.8, 2.7.0.7, 2.7.0.6 (global constraint requires ==2.7.0.5)
trying: hat-2.7.0.5
next goal: haskeline (dependency of hat-2.7.0.5)
rejecting: haskeline-0.7.2.1/installed-0a4... (conflict: haskeline =>
directory==1.2.2.0/installed-258..., hat => directory==1.1.*)
trying: haskeline-0.7.2.1
trying: filepath-1.4.0.0/installed-8fe... (dependency of haskeline-0.7.2.1)
next goal: process (dependency of hat-2.7.0.5)
rejecting: process-1.2.3.0/installed-f02..., 1.4.1.0, 1.4.0.0, 1.3.0.0,
1.2.3.0, 1.2.2.0, 1.2.1.0, 1.2.0.0 (conflict: hat => process==1.1.*)
rejecting: process-1.1.0.2, 1.1.0.1 (conflict:
filepath==1.4.0.0/installed-8fe..., process => filepath>=1.1 && <1.4)
rejecting: process-1.1.0.0 (conflict: filepath==1.4.0.0/installed-8fe...,
process => filepath>=1.1 && <1.3)
rejecting: process-1.0.1.5, 1.0.1.4, 1.0.1.3, 1.0.1.2, 1.0.1.1, 1.0.0.0
(conflict: hat => process==1.1.*)
Dependency tree exhaustively searched.