Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: trasa-form-0.4.1 (user goal)
[__1] trying: unordered-containers-0.2.19.1 (dependency of trasa-form)
[__2] trying: hashable-1.4.1.0 (dependency of unordered-containers)
[__3] next goal: trasa (dependency of trasa-form)
[__3] rejecting: trasa-0.4.1 (conflict: hashable==1.4.1.0, trasa =>
hashable==1.2.*)
[__3] skipping: trasa-0.4, trasa-0.3, trasa-0.2 (has the same characteristics
that caused the previous version to fail: excludes 'hashable' version 1.4.1.0)
[__3] rejecting: trasa-0.1 (conflict: trasa-form => trasa>=0.4.1)
[__3] fail (backjumping, conflict set: hashable, trasa, trasa-form)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, hashable, trasa-form, trasa,
unordered-containers
Try running with --minimize-conflict-set to improve the error message.