Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: UMM (user goal)
rejecting: UMM-0.3.1, 0.3.0, 0.2.2, 0.2.1, 0.2.0, 0.1.6, 0.1.5, 0.1.4, 0.1.3,
0.1.1 (global constraint requires ==0.1.0)
trying: UMM-0.1.0
trying: base-4.8.1.0/installed-4f7... (dependency of UMM-0.1.0)
trying: old-time-1.1.0.3 (dependency of UMM-0.1.0)
trying: parsec-3.1.9 (dependency of UMM-0.1.0)
trying: text-1.2.1.3 (dependency of parsec-3.1.9)
trying: deepseq-1.4.1.1/installed-8fb... (dependency of text-1.2.1.3)
next goal: haskell98 (dependency of UMM-0.1.0)
rejecting: haskell98-2.0.0.3 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base>=4.7 && <4.8)
rejecting: haskell98-2.0.0.2 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base==4.6.*)
rejecting: haskell98-2.0.0.1 (conflict: deepseq =>
array==0.5.1.0/installed-d42..., haskell98 => array>=0.3 && <0.5)
rejecting: haskell98-2.0.0.0 (conflict: old-time==1.1.0.3, haskell98 =>
old-time>=1.0 && <1.1)
rejecting: haskell98-1.1.0.1, 1.1.0.0, 1.0.1.1 (conflict:
base==4.8.1.0/installed-4f7..., haskell98 => base>=3 && <4.6)
rejecting: haskell98-1.0.1.0 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base<4.6)
rejecting: haskell98-1.0 (conflict: base==4.8.1.0/installed-4f7..., haskell98
=> base<4.3)
Backjump limit reached (change with --max-backjumps).