Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: hat (user goal)
rejecting: hat-2.9.0.0, hat-2.8.0.0, hat-2.7.0.12, hat-2.7.0.11, hat-2.7.0.10,
hat-2.7.0.9, hat-2.7.0.8, hat-2.7.0.7, hat-2.7.0.6 (constraint from user
target requires ==2.7.0.5)
trying: hat-2.7.0.5
trying: filepath-1.4.1.0/installed-1.4... (dependency of haskeline-0.7.2.3)
next goal: process (dependency of hat-2.7.0.5)
rejecting: process-1.4.2.0/installed-1.4..., process-1.4.3.0, process-1.4.2.0,
process-1.4.1.0, process-1.4.0.0, process-1.3.0.0, process-1.2.3.0,
process-1.2.2.0, process-1.2.1.0, process-1.2.0.0 (conflict: hat =>
process==1.1.*)
rejecting: process-1.1.0.2, process-1.1.0.1 (conflict:
filepath==1.4.1.0/installed-1.4..., process => filepath>=1.1 && <1.4)
rejecting: process-1.1.0.0 (conflict: filepath==1.4.1.0/installed-1.4...,
process => filepath>=1.1 && <1.3)
rejecting: process-1.0.1.5, process-1.0.1.4, process-1.0.1.3, process-1.0.1.2,
process-1.0.1.1, process-1.0.0.0 (conflict: hat => process==1.1.*)
Dependency tree exhaustively searched.