ghc --version
The Glorious Glasgow Haskell Compilation System, version 9.6.3
cabal install --lib codeworld-api
Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: base (user goal)
[__0] rejecting: base-4.19.0.0 (constraint from user target requires
==4.18.1.0)
[__0] trying: base-4.18.1.0/installed-4.18.1.0
[__1] next goal: blank-canvas (user goal)
[__1] rejecting: blank-canvas-0.7.4/installed-156550ab (package is broken,
missing dependency sn-2.2.1.0-47c7f308)
[__1] trying: blank-canvas-0.7.4
[__2] trying: aeson-2.2.1.0 (dependency of blank-canvas)
[__3] trying: bytestring-0.12.0.2/installed-7ba28044 (user goal)
[__4] next goal: codeworld-api (user goal)
[__4] rejecting: codeworld-api-0.8.1 (conflict: aeson==2.2.1.0, codeworld-api
=> aeson>=1.4.3 && <2.2)
[__4] skipping: codeworld-api-0.8.0, codeworld-api-0.7.0, codeworld-api-0.6.0,
codeworld-api-0.5.0, codeworld-api-0.4.0 (has the same characteristics that
caused the previous version to fail: excludes 'aeson' version 2.2.1.0)
[__4] rejecting: codeworld-api-0.3.1 (conflict: blank-canvas==0.7.4,
codeworld-api => blank-canvas>=0.6 && <0.7)
[__4] skipping: codeworld-api-0.3, codeworld-api-0.2.5, codeworld-api-0.2.4,
codeworld-api-0.2.3, codeworld-api-0.2.2.1, codeworld-api-0.2.2.0,
codeworld-api-0.2.1.0 (has the same characteristics that caused the previous
version to fail: excludes 'blank-canvas' version 0.7.4)
[__4] rejecting: codeworld-api-0.2.0.0 (conflict:
base==4.18.1.0/installed-4.18.1.0, codeworld-api => base>=4.8 && <4.11)
[__4] skipping: codeworld-api-0.1.0.1 (has the same characteristics that
caused the previous version to fail: excludes 'base' version 4.18.1.0)
[__4] fail (backjumping, conflict set: aeson, base, blank-canvas,
codeworld-api)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: bytestring, aeson, blank-canvas, base,
codeworld-api
Try running with --minimize-conflict-set to improve the error message.
ghc --version
The Glorious Glasgow Haskell Compilation System, version 9.6.3
cabal install --lib codeworld-api
Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: base (user goal)
[__0] rejecting: base-4.19.0.0 (constraint from user target requires
==4.18.1.0)
[__0] trying: base-4.18.1.0/installed-4.18.1.0
[__1] next goal: blank-canvas (user goal)
[__1] rejecting: blank-canvas-0.7.4/installed-156550ab (package is broken,
missing dependency sn-2.2.1.0-47c7f308)
[__1] trying: blank-canvas-0.7.4
[__2] trying: aeson-2.2.1.0 (dependency of blank-canvas)
[__3] trying: bytestring-0.12.0.2/installed-7ba28044 (user goal)
[__4] next goal: codeworld-api (user goal)
[__4] rejecting: codeworld-api-0.8.1 (conflict: aeson==2.2.1.0, codeworld-api
=> aeson>=1.4.3 && <2.2)
[__4] skipping: codeworld-api-0.8.0, codeworld-api-0.7.0, codeworld-api-0.6.0,
codeworld-api-0.5.0, codeworld-api-0.4.0 (has the same characteristics that
caused the previous version to fail: excludes 'aeson' version 2.2.1.0)
[__4] rejecting: codeworld-api-0.3.1 (conflict: blank-canvas==0.7.4,
codeworld-api => blank-canvas>=0.6 && <0.7)
[__4] skipping: codeworld-api-0.3, codeworld-api-0.2.5, codeworld-api-0.2.4,
codeworld-api-0.2.3, codeworld-api-0.2.2.1, codeworld-api-0.2.2.0,
codeworld-api-0.2.1.0 (has the same characteristics that caused the previous
version to fail: excludes 'blank-canvas' version 0.7.4)
[__4] rejecting: codeworld-api-0.2.0.0 (conflict:
base==4.18.1.0/installed-4.18.1.0, codeworld-api => base>=4.8 && <4.11)
[__4] skipping: codeworld-api-0.1.0.1 (has the same characteristics that
caused the previous version to fail: excludes 'base' version 4.18.1.0)
[__4] fail (backjumping, conflict set: aeson, base, blank-canvas,
codeworld-api)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: bytestring, aeson, blank-canvas, base,
codeworld-api
Try running with --minimize-conflict-set to improve the error message.