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: heatitup-complete-0.5.4.0 (user goal)
[__1] trying: pipes-text-0.0.2.5 (dependency of heatitup-complete)
[__2] trying: transformers-0.5.5.0/installed-0.5... (dependency of pipes-text)
[__3] next goal: pipes-safe (dependency of pipes-text)
[__3] rejecting: pipes-safe-2.3.1 (conflict: pipes-text => pipes-safe>=2.1 &&
<2.3)
[__3] rejecting: pipes-safe-2.2.9, pipes-safe-2.2.8 (conflict: transformers =>
base==4.12.0.0/installed-4.1..., pipes-safe => base>=4.6 && <4.12)
[__3] trying: pipes-safe-2.2.6
[__4] next goal: exceptions (dependency of pipes-safe)
[__4] rejecting: exceptions-0.10.2, exceptions-0.10.1, exceptions-0.10.0
(conflict: pipes-safe => exceptions>=0.6 && <0.9)
[__4] trying: exceptions-0.8.3
[__5] next goal: template-haskell (dependency of exceptions)
[__5] rejecting: template-haskell-2.14.0.0/installed-2.1... (conflict:
exceptions => template-haskell>=2.2 && <2.14)
[__5] rejecting: template-haskell-2.14.0.0, template-haskell-2.13.0.0,
template-haskell-2.12.0.0, template-haskell-2.11.1.0,
template-haskell-2.11.0.0, template-haskell-2.10.0.0,
template-haskell-2.9.0.0, template-haskell-2.8.0.0, template-haskell-2.7.0.0,
template-haskell-2.6.0.0, template-haskell-2.5.0.0, template-haskell-2.4.0.1,
template-haskell-2.4.0.0, template-haskell-2.3.0.1, template-haskell-2.3.0.0,
template-haskell-2.2.0.0 (constraint from non-upgradeable package requires
installed instance)
[__5] fail (backjumping, conflict set: exceptions, template-haskell)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: template-haskell, exceptions,
transformers, pipes-safe, pipes-text, base, heatitup-complete