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: haskell-stack-trace-plugin-0.1.0.0 (user goal)
[__1] next goal: ghc (dependency of haskell-stack-trace-plugin)
[__1] rejecting: ghc-8.6.1/installed-8.6..., ghc-8.6.1, ghc-8.4.3, ghc-8.4.1,
ghc-8.2.2, ghc-8.2.1 (conflict: haskell-stack-trace-plugin => ghc==8.6.2)
[__1] fail (backjumping, conflict set: ghc, haskell-stack-trace-plugin)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: haskell-stack-trace-plugin, ghc