Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: she (user goal)
rejecting: she-0.6, she-0.5, she-0.4, she-0.3, she-0.2, she-0.1 (constraint
from user target requires ==0.0)
trying: she-0.0
trying: base-4.9.0.0/installed-4.9... (dependency of she-0.0)
next goal: mtl (dependency of she-0.0)
rejecting: mtl-2.2.1, mtl-2.2.0.1, mtl-2.2, mtl-2.1.3.1, mtl-2.1.2, mtl-2.1.1,
mtl-2.1, mtl-2.0.1.1, mtl-2.0.1.0, mtl-2.0.0.0, mtl-1.1.1.1, mtl-1.1.1.0,
mtl-1.1.0.2, mtl-1.1.0.1, mtl-1.1.0.0 (conflict: she => mtl<1.1)
rejecting: mtl-1.0 (conflict: base==4.9.0.0/installed-4.9..., mtl => base<4.3)
Dependency tree exhaustively searched.