% cabal build all -c 'transformers-compat>=0.8' --allow-newer=servant-swagger-ui-core:transformers-compat
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.12.1.0 supports
'ghc' version < 9.12): /home/janus/.ghcup/bin/ghc is version 9.12.2
Resolving dependencies...
Error: [Cabal-7107]
Could not resolve dependencies:
[__0] trying: servant-swagger-ui-0.3.5.5.0.1 (user goal)
[__1] trying: servant-server-0.20.3.0 (dependency of servant-swagger-ui)
[__2] trying: transformers-base-0.4.6 (dependency of servant-server)
[__3] trying: transformers-compat-0.8 (dependency of transformers-base)
[__4] next goal: monad-control (dependency of servant-server)
[__4] rejecting: monad-control-1.0.3.1 (conflict: transformers-compat==0.8, monad-control => transformers-compat>=0.3 && <0.8)
[__4] skipping: monad-control; 1.0.3, 1.0.2.4, 1.0.2.3, 1.0.2.2, 1.0.2.1, 1.0.2.0, 1.0.1.0, 1.0.0.5, 1.0.0.4, 1.0.0.3 (has the same characteristics that caused the previous version to fail: excludes 'transformers-compat' version 0.8)
[__4] rejecting: monad-control-1.0.0.2 (conflict: servant-server => monad-control>=1.0.2.3 && <1.1)
[__4] skipping: monad-control; 1.0.0.1, 1.0.0.0, 0.3.3.1, 0.3.3.0, 0.3.2.3, 0.3.2.2, 0.3.2.1, 0.3.2, 0.3.1.4, 0.3.1.3, 0.3.1.2, 0.3.1.1, 0.3.1, 0.3.0.1, 0.3, 0.2.0.3, 0.2.0.2, 0.2.0.1, 0.2, 0.1 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=1.0.2.3 && <1.1' from 'servant-server')
[__4] fail (backjumping, conflict set: monad-control, servant-server, transformers-compat)
After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: servant-server, transformers-compat, monad-control, servant-swagger-ui, transformers-base
Try running with --minimize-conflict-set to improve the error message.