Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: json-tools (user goal)
rejecting: json-tools-0.5.0, 0.4.0, 0.3.1 (global constraint requires ==0.3.0)
trying: json-tools-0.3.0
trying: tar-0.4.2.2 (dependency of json-tools-0.3.0)
trying: directory-1.2.2.0/installed-258... (dependency of tar-0.4.2.2)
trying: unix-2.7.1.0/installed-643... (dependency of
directory-1.2.2.0/installed-258...)
next goal: data-object-json (dependency of json-tools-0.3.0)
rejecting: data-object-json-0.3.1.8, 0.3.1.7, 0.3.1.6, 0.3.1.5, 0.3.1.4,
0.3.1.3, 0.3.1.2, 0.3.1.1, 0.3.1, 0.3.0, 0.0.0.1, 0.0.0 (conflict: unix =>
bytestring==0.10.6.0/installed-236..., data-object-json => bytestring>=0.9.1.4
&& <0.10)
Backjump limit reached (change with --max-backjumps).