Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: birch-beer-0.4.1.0 (user goal)
[__1] trying: typed-spreadsheet-1.1.5 (dependency of birch-beer)
[__2] trying: async-2.2.3 (dependency of typed-spreadsheet)
[__3] trying: hashable-1.3.1.0 (dependency of async)
[__4] trying: plots-0.1.1.2 (dependency of birch-beer)
[__5] trying: diagrams-core-1.4.2 (dependency of plots)
[__6] next goal: base (dependency of birch-beer)
[__6] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict: diagrams-core =>
base>=4.2 && <4.14)
[__6] skipping: base-4.15.0.0, base-4.14.1.0, base-4.14.0.0 (has the same
characteristics that caused the previous version to fail: excluded by
constraint '>=4.2 && <4.14' from 'diagrams-core')
[__6] rejecting: base-4.13.0.0, base-4.12.0.0, 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)
[__6] fail (backjumping, conflict set: base, birch-beer, diagrams-core)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, diagrams-core, hashable, async,
plots, birch-beer, typed-spreadsheet
Try running with --minimize-conflict-set to improve the error message.