Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: category-extras (user goal)
rejecting: category-extras-1.0.2, 1.0.1, 1.0 (global constraint requires
==0.53.5.1)
trying: category-extras-0.53.5.1
trying: base-4.8.1.0/installed-4f7... (dependency of category-extras-0.53.5.1)
next goal: mtl (dependency of category-extras-0.53.5.1)
rejecting: mtl-2.2.1, 2.2.0.1, 2.2, 2.1.3.1, 2.1.2, 2.1.1, 2.1, 2.0.1.1,
2.0.1.0, 2.0.0.0 (conflict: category-extras => mtl>=1.1 && <2)
rejecting: mtl-1.1.1.1, 1.1.1.0 (conflict: base==4.8.1.0/installed-4f7..., mtl
=> base<4.6)
rejecting: mtl-1.1.0.2, 1.1.0.1, 1.1.0.0 (conflict:
base==4.8.1.0/installed-4f7..., mtl => base<4.3)
rejecting: mtl-1.0 (conflict: category-extras => mtl>=1.1 && <2)
Dependency tree exhaustively searched.