Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: argon-0.4.2.0 (user goal)
[__1] trying: lens-simple-0.1.0.9 (dependency of argon)
[__2] trying: transformers-0.6.1.0/installed-0.6.1.0 (dependency of
lens-simple)
[__3] next goal: lens-family-core (dependency of lens-simple)
[__3] rejecting: lens-family-core-2.1.3 (conflict: lens-simple =>
lens-family-core>=1.2 && <1.3)
[__3] skipping: lens-family-core-2.1.2, lens-family-core-2.1.0,
lens-family-core-2.0.0 (has the same characteristics that caused the previous
version to fail: excluded by constraint '>=1.2 && <1.3' from 'lens-simple')
[__3] rejecting: lens-family-core-1.2.3 (conflict:
transformers==0.6.1.0/installed-0.6.1.0, lens-family-core =>
transformers>=0.2.0 && <0.6)
[__3] skipping: lens-family-core-1.2.2, lens-family-core-1.2.1,
lens-family-core-1.2.0, lens-family-core-1.1.0, lens-family-core-1.0.1,
lens-family-core-1.0.0, lens-family-core-0.1.0, lens-family-core-0.0.1,
lens-family-core-0.0.0 (has the same characteristics that caused the previous
version to fail: excludes 'transformers' version 0.6.1.0)
[__3] fail (backjumping, conflict set: lens-family-core, lens-simple,
transformers)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: transformers, base, lens-simple,
lens-family, lens-family-core, argon
Try running with --minimize-conflict-set to improve the error message.