Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: haskell-language-server-1.9.1.0 (user goal)
[__1] trying: haskell-language-server:+callhierarchy
[__2] next goal: hls-call-hierarchy-plugin (dependency of
haskell-language-server +callhierarchy)
[__2] rejecting: hls-call-hierarchy-plugin-1.2.0.0 (conflict:
haskell-language-server +callhierarchy => hls-call-hierarchy-plugin^>=1.1)
[__2] trying: hls-call-hierarchy-plugin-1.1.0.0
[__3] next goal: hls-plugin-api (dependency of haskell-language-server)
[__3] rejecting: hls-plugin-api-1.6.0.0 (conflict: hls-call-hierarchy-plugin
=> hls-plugin-api^>=1.5)
[__3] rejecting: hls-plugin-api-1.5.0.0 (conflict: haskell-language-server =>
hls-plugin-api^>=1.6)
[__3] skipping: hls-plugin-api-1.4.0.0, hls-plugin-api-1.3.0.0,
hls-plugin-api-1.2.0.2, hls-plugin-api-1.2.0.1, hls-plugin-api-1.2.0.0,
hls-plugin-api-1.1.0.2, hls-plugin-api-1.1.0.1, hls-plugin-api-1.1.0.0,
hls-plugin-api-1.0.0.0, hls-plugin-api-0.7.1.0, hls-plugin-api-0.7.0.0,
hls-plugin-api-0.6.0.0, hls-plugin-api-0.5.0.1, hls-plugin-api-0.5.0.0,
hls-plugin-api-0.4.1.0, hls-plugin-api-0.4.0.0 (has the same characteristics
that caused the previous version to fail: excluded by constraint '^>=1.6' from
'haskell-language-server')
[__3] fail (backjumping, conflict set: haskell-language-server,
hls-call-hierarchy-plugin, hls-plugin-api)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: haskell-language-server,
hls-plugin-api, hls-call-hierarchy-plugin,
haskell-language-server:callhierarchy
Try running with --minimize-conflict-set to improve the error message.