Warning: The install command is a part of the legacy v1 style of cabal usage.

Please switch to using either the new project style and the new-install
command or the legacy v1-install alias as new-style projects will become the
default in the next version of cabal-install. Please file a bug if you cannot
replicate a working v1- use case with the new-style commands.

For more information, see: https://wiki.haskell.org/Cabal/NewBuild

Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: postgres-websockets-0.5.0.1 (user goal)
[__1] trying: warp-3.2.25 (dependency of postgres-websockets)
[__2] trying: http-date-0.0.8 (dependency of warp)
[__3] trying: attoparsec-0.13.2.2 (dependency of http-date)
[__4] trying: scientific-0.3.6.2 (dependency of attoparsec)
[__5] trying: binary-0.8.6.0/installed-0.8... (dependency of scientific)
[__6] trying: stm-containers-1.1.0.2 (dependency of postgres-websockets)
[__7] next goal: deferred-folds (dependency of stm-containers)
[__7] rejecting: deferred-folds-0.9.9, deferred-folds-0.9.8,
deferred-folds-0.9.7.1, deferred-folds-0.9.7, deferred-folds-0.9.6,
deferred-folds-0.9.5, deferred-folds-0.9.4, deferred-folds-0.9.3,
deferred-folds-0.9.2, deferred-folds-0.9.1, deferred-folds-0.9 (conflict:
binary => containers==0.6.0.1/installed-0.6..., deferred-folds =>
containers>=0.5 && <0.6)
[__7] rejecting: deferred-folds-0.8, deferred-folds-0.7.2,
deferred-folds-0.7.1, deferred-folds-0.7, deferred-folds-0.6.12,
deferred-folds-0.6.11, deferred-folds-0.6.10, deferred-folds-0.6.9,
deferred-folds-0.6.8, deferred-folds-0.6.7, deferred-folds-0.6.6,
deferred-folds-0.6.5.1, deferred-folds-0.6.5, deferred-folds-0.6.4,
deferred-folds-0.6.3, deferred-folds-0.6.2, deferred-folds-0.6.1,
deferred-folds-0.6, deferred-folds-0.5.2, deferred-folds-0.5.1,
deferred-folds-0.5, deferred-folds-0.4.1, deferred-folds-0.4.0.1,
deferred-folds-0.4, deferred-folds-0.3.0.1, deferred-folds-0.3,
deferred-folds-0.2.3, deferred-folds-0.2.2, deferred-folds-0.2.1,
deferred-folds-0.2, deferred-folds-0.1 (conflict: stm-containers =>
deferred-folds>=0.9 && <0.10)
[__7] fail (backjumping, conflict set: binary, deferred-folds, stm-containers)
Backjump limit reached (currently 2000, change with --max-backjumps or try to
run with --reorder-goals).