Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: HaXml (user goal)
rejecting: HaXml-1.25.3, HaXml-1.25.2, HaXml-1.25.1, HaXml-1.25, HaXml-1.24.1,
HaXml-1.24, HaXml-1.23.3, HaXml-1.23.2, HaXml-1.23.1 (constraint from user
target requires ==1.23)
trying: HaXml-1.23
next goal: base (dependency of HaXml-1.23)
rejecting: base-4.9.0.0/installed-4.9... (conflict: HaXml => base<0 || <3)
rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
Dependency tree exhaustively searched.