Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: boomslang (user goal)
rejecting: boomslang-0.0.4, boomslang-0.0.3 (constraint from user target
requires ==0.0.2)
trying: boomslang-0.0.2
trying: base-4.9.0.0/installed-4.9... (dependency of boomslang-0.0.2)
next goal: mtl (dependency of boomslang-0.0.2)
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 (conflict: boomslang =>
mtl==1.*)
rejecting: mtl-1.1.1.1, mtl-1.1.1.0 (conflict: base==4.9.0.0/installed-4.9...,
mtl => base<4.6)
rejecting: mtl-1.1.0.2, mtl-1.1.0.1, mtl-1.1.0.0, mtl-1.0 (conflict:
base==4.9.0.0/installed-4.9..., mtl => base<4.3)
Dependency tree exhaustively searched.