ormolu-0.5.0.1 broken …

[yvan-sraka]

Steps To Reproduce

nix-shell -p ormolu with current nixpkgs-unstable, will produce error:

error: cycle detected in build of '/nix/store/mn4cj42d5b99i1iky0k6z0iq0m8jwrix-ormolu-0.5.0.1.drv' in the references of output 'bin' from output 'out'

Build log

https://gist.github.com/c0207dde2cda91d1883fb6c1e4815b2a

Additional context

The content of /nix/store/mn4cj42d5b99i1iky0k6z0iq0m8jwrix-ormolu-0.5.0.1.drv produced.

Notify maintainers

Cross-posted here: tweag/ormolu#965

Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

yvan@Butternut ~ % nix-shell -p nix-info --run "nix-info -m"
 - system: `"aarch64-darwin"`
 - host os: `Darwin 22.2.0, macOS 13.1`
 - multi-user?: `yes`
 - sandbox: `no`
 - version: `nix-env (Nix) 2.12.0`
 - channels(yvan): `"darwin, home-manager, nixpkgs"`
 - channels(root): `""`
 - nixpkgs: `/Users/yvan/.nix-defexpr/channels/nixpkgs`

[srid]

See #140774 (comment)

[haroldcarr]

Last night I helped a friend get setup using GHC via devenv.sh.
We used this devenv.nix file (that works for me):

{ pkgs, ... }:

{
  packages = [ pkgs.ghc
               pkgs.git
               pkgs.haskell-language-server
               pkgs.hlint
               pkgs.stylish-haskell
             ];

  languages.haskell.enable = true;
  languages.nix.enable     = true;
}

We got the "ormolu cycle". Ugh.

In our case, the workaround was for me to have him delete his devenv.lock file and replace it with mine (which points to older stuff).

But this means anyone trying GHC via devenv is going to hit this.
Not a good first look.

[yvan-sraka]

This has been fixed :)