Resolving dependencies...
cabal: Could not resolve dependencies:
trying: base-4.9.0.0/installed-4.9... (dependency of json2yaml-0.2.2)
next goal: data-object-json (dependency of json2yaml-0.2.2)
rejecting: data-object-json-0.3.1.8, data-object-json-0.3.1.7,
data-object-json-0.3.1.6, data-object-json-0.3.1.5, data-object-json-0.3.1.4,
data-object-json-0.3.1.3, data-object-json-0.3.1.2, data-object-json-0.3.1.1,
data-object-json-0.3.1, data-object-json-0.3.0 (conflict: json2yaml =>
data-object-json>=0.0.0 && <0.1)
trying: data-object-json-0.0.0.1
next goal: json-b (dependency of data-object-json-0.0.0.1)
rejecting: json-b-0.0.4 (conflict: base==4.9.0.0/installed-4.9..., json-b =>
base>=2 && <4)
rejecting: json-b-0.0.3, json-b-0.0.2, json-b-0.0.1, json-b-0.0.0 (conflict:
data-object-json => json-b>=0.0.4 && <0.1)
Dependency tree exhaustively searched.