haskell-language-server on  master [!] took 9s 
> cabal install --overwrite-policy=always
cabal: Could not resolve dependencies:
[__0] next goal: ghcide (user goal)
[__0] rejecting: ghcide-0.2.0 (constraint from user target requires ==0.1.0)
[__0] trying: ghcide-0.1.0
[__1] trying: ghcide:-ghc-lib
[__2] next goal: hie-bios (dependency of ghcide -ghc-lib)
[__2] rejecting: hie-bios-0.6.1, hie-bios-0.6.0, hie-bios-0.5.1,
hie-bios-0.5.0 (conflict: ghcide -ghc-lib => hie-bios>=0.4.0 && <0.5)
[__2] trying: hie-bios-0.4.0
[__3] next goal: ghc (dependency of ghcide -ghc-lib)
[__3] rejecting: ghc-8.10.1/installed-8.10.1 (conflict: hie-bios => ghc>=8.4.1
&& <8.9)
[__3] skipping: ghc-8.10.1 (has the same characteristics that caused the
previous version to fail: excluded by constraint '>=8.4.1 && <8.9' from
'hie-bios')
[__3] trying: ghc-8.8.3
[__4] next goal: base (dependency of ghcide)
[__4] rejecting: base-4.14.0.0/installed-4.14.0.0 (conflict: ghc => base<0 &&
==4.13.*)
[__4] skipping: base-4.14.0.0, base-4.13.0.0, base-4.12.0.0, base-4.11.1.0,
base-4.11.0.0, base-4.10.1.0, base-4.10.0.0, base-4.9.1.0, base-4.9.0.0,
base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1,
base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0,
base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2,
base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2,
base-3.0.3.1 (has the same characteristics that caused the previous version to
fail: excluded by constraint '<0 && ==4.13.*' from 'ghc')
[__4] fail (backjumping, conflict set: base, ghc, ghcide)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: ghcide, ghc, base, ghcide:ghc-lib,
hie-bios
Try running with --minimize-conflict-set to improve the error message.