Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: project-m36-0.5 (user goal)
[__1] next goal: ghc (dependency of project-m36)
[__1] rejecting: ghc-8.4.3/installed-8.4..., ghc-8.4.3, ghc-8.4.1 (conflict:
project-m36 => ghc>=7.8 && <8.3)
[__1] trying: ghc-8.2.2
[__2] next goal: base (dependency of project-m36)
[__2] rejecting: base-4.11.1.0/installed-4.1... (conflict: ghc => base<0 &&
==4.10.*)
[__2] rejecting: base-4.11.1.0, base-4.11.0.0, base-4.10.1.0, base-4.10.0.0,
base-4.9.1.0, 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)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: project-m36, base, ghc