happy-plan-to-nix-pkgs fails on hello-world with flake + haskell.nix + stackProject

[hhefesto]

Describe the bug

Happy fails to build for derivation 'ghc-shell-for-hello-world' on a basic hello-world app built with stackProject.

I made a repo to reproduce the problem: https://github.com/hhefesto/reproduce-happy-ghc-shell-for-error

Steps To Reproduce

nix develop github:hhefesto/reproduce-happy-ghc-shell-for-error

or follow:

https://github.com/hhefesto/reproduce-happy-ghc-shell-for-error/blob/master/steps-to-reproduce.md

Expected behavior

Get a nix develop shell without errors

Additional context

Add any other context about the problem here.

[hhefesto]

I still run into this error on my company's code. I've been trying to make the small repo reproduce the error but have failed after some days (maybe you'll know what's happening):

$ rm flake.lock
$ nix develop --show-trace
warning: Git tree '/Users/danielherrera/src/portal-suite' is dirty
warning: Using saved setting for 'allow-import-from-derivation = true' from ~/.local/share/nix/trusted-settings.json.
warning: Using saved setting for 'extra-substituters = https://cache.iog.io' from ~/.local/share/nix/trusted-settings.json.
warning: Using saved setting for 'extra-trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=' from ~/.local/share/nix/trusted-settings.json.
trace: haskell-nix.haskellLib.cleanGit: /nix/store/5mbacb2wiimxb8kvn9cjm7znj406na36-source does not seem to be a git repository,
assuming it is a clean checkout.
trace: No index state specified for alex, using the latest index state that we know about (2022-12-01T00:00:00Z)!
trace: No index state specified for happy, using the latest index state that we know about (2022-12-01T00:00:00Z)!
error: builder for '/nix/store/vkvb3a6mcb62l2igcxhvhjjj7fwkadf7-happy-plan-to-nix-pkgs.drv' failed with exit code 1;
       last 10 log lines:
       > 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' from 'happy')
       > [__1] fail (backjumping, conflict set: base, happy)
       > After searching the rest of the dependency tree exhaustively, these were the
       > goals I've had most trouble fulfilling: happy, base
       >
       For full logs, run 'nix log /nix/store/vkvb3a6mcb62l2igcxhvhjjj7fwkadf7-happy-plan-to-nix-pkgs.drv'.

       … while realising the context of path '/nix/store/wj8cw6932pkz67sn0baq0x900g0g96gs-happy-plan-to-nix-pkgs'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/lib/import-and-filter-project.nix:18:13:

           17|   projectSubDir'' = if projectSubDir == "" then "" else projectSubDir + "/"; # With trailing /
           18|   project = import "${projectNix}${projectSubDir'}";
             |             ^
           19| in project // {

       … while evaluating anonymous lambda

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/lib/import-and-filter-project.nix:5:1:

            4| { pkgs, haskellLib }:
            5| { projectNix, sourceRepos, src }:
             | ^
            6| let

       … from call site

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/overlays/haskell.nix:516:27:

          515|               callProjectResults = callCabalProjectToNix args;
          516|               plan-pkgs = importAndFilterProject {
             |                           ^
          517|                 inherit (callProjectResults) projectNix sourceRepos src;

       … while evaluating the attribute 'pkg-set'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/overlays/haskell.nix:548:26:

          547|                   inherit (pkg-set.config) hsPkgs;
          548|                   inherit pkg-set;
             |                          ^
          549|                   plan-nix = callProjectResults.projectNix;

       … while evaluating 'getPackage'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/overlays/haskell.nix:705:26:

          704|             # cabal configure errors are defered until the components derivation builds.
          705|             getPackage = packageName:
             |                          ^
          706|               if rawProject.pkg-set ? configurationError

       … from call site

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/overlays/haskell.nix:501:14:

          500|           let project = hackage-project projectModule;
          501|           in project.getPackage project.args.name;
             |              ^
          502|         hackage-project = projectModule:

       … while evaluating 'hackage-package'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/overlays/haskell.nix:499:27:

          498|         # is required, a specific index-state should be provided!
          499|         hackage-package = projectModule:
             |                           ^
          500|           let project = hackage-project projectModule;

       … from call site

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/overlays/tools.nix:66:17:

           65|     let
           66|       package = final.haskell-nix.hackage-package (projectModules ++ [
             |                 ^
           67|           ({lib, ...}: {

       … while evaluating 'hackage-tool'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/overlays/tools.nix:64:18:

           63|
           64|   hackage-tool = projectModules:
             |                  ^
           65|     let

       … from call site

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/overlays/tools.nix:82:7:

           81|   tool = compiler-nix-name: name: versionOrMod:
           82|       final.haskell-nix.hackage-tool (
             |       ^
           83|            final.haskell-nix.haskellLib.versionOrModToMods versionOrMod

       … while evaluating 'tool'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/overlays/tools.nix:81:35:

           80|
           81|   tool = compiler-nix-name: name: versionOrMod:
             |                                   ^
           82|       final.haskell-nix.hackage-tool (

       … from call site

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/modules/configuration-nix.nix:116:6:

          115|     (pkgs.buildPackages.haskell-nix.tool config.compiler.nix-name "alex" {})
          116|     (pkgs.buildPackages.haskell-nix.tool config.compiler.nix-name "happy" {})
             |      ^
          117|   ];

       … while evaluating the attribute 'value'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/modules/plan.nix:46:38:

           45|               elemType
           46|               [{ inherit (def) file; value = def'; }]
             |                                      ^
           47|             ).optionalValue

       … while evaluating 'dischargeProperties'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:805:25:

          804|   */
          805|   dischargeProperties = def:
             |                         ^
          806|     if def._type or "" == "merge" then

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:734:137:

          733|         defs' = concatMap (m:
          734|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
             |                                                                                                                                         ^
          735|         ) defs;

       … while evaluating definitions from `/nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/modules/configuration-nix.nix':

       … while evaluating anonymous lambda

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:733:28:

          732|         # Process mkMerge and mkIf properties.
          733|         defs' = concatMap (m:
             |                            ^
          734|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:733:17:

          732|         # Process mkMerge and mkIf properties.
          733|         defs' = concatMap (m:
             |                 ^
          734|           map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))

       … while evaluating the attribute 'values'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:846:7:

          845|     in {
          846|       values = concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;
             |       ^
          847|       inherit highestPrio;

       … while evaluating the attribute 'values'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:747:9:

          746|       in {
          747|         values = defs''';
             |         ^
          748|         inherit (defs'') highestPrio;

       … while evaluating the attribute 'optionalValue'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:765:5:

          764|
          765|     optionalValue =
             |     ^
          766|       if isDefined then { value = mergedValue; }

       … while evaluating anonymous lambda

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/modules/plan.nix:42:21:

           41|         if isList def.value then
           42|           imap1 (m: def':
             |                     ^
           43|             (mergeDefinitions

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/lists.nix:117:32:

          116|   */
          117|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                                ^
          118|

       … while evaluating anonymous lambda

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/lists.nix:117:29:

          116|   */
          117|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                             ^
          118|

       … from call site

       … while evaluating anonymous lambda

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/modules/plan.nix:40:33:

           39|     merge = loc: defs:
           40|       map (x: x.value) (filter (x: x ? value && x.value != null) (concatLists (imap1 (n: def:
             |                                 ^
           41|         if isList def.value then

       … from call site

       … while evaluating 'merge'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/modules/plan.nix:39:18:

           38|     # Mostly copied from nixpkgs/lib/types.nix
           39|     merge = loc: defs:
             |                  ^
           40|       map (x: x.value) (filter (x: x ? value && x.value != null) (concatLists (imap1 (n: def:

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:755:59:

          754|       if isDefined then
          755|         if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
             |                                                           ^
          756|         else let allInvalid = filter (def: ! type.check def.value) defsFinal;

       … while evaluating the attribute 'mergedValue'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:753:5:

          752|     # Type-check the remaining definitions, and merge them. Or throw if no definitions.
          753|     mergedValue =
             |     ^
          754|       if isDefined then

       … while evaluating the option `packages.Sit.components.library.build-tools':

       … while evaluating the attribute 'value'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:719:9:

          718|     in warnDeprecation opt //
          719|       { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          720|         inherit (res.defsFinal') highestPrio;

       … while evaluating anonymous lambda

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/modules.nix:268:72:

          267|           # For definitions that have an associated option
          268|           declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
             |                                                                        ^
          269|

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/attrsets.nix:401:20:

          400|               then recurse (path ++ [name]) value
          401|               else f (path ++ [name]) value;
             |                    ^
          402|         in mapAttrs g;

       … while evaluating 'g'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/attrsets.nix:398:19:

          397|           g =
          398|             name: value:
             |                   ^
          399|             if isAttrs value && cond value

       … from call site

       … while evaluating the attribute 'executableToolDepends'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/builder/comp-builder.nix:349:14:

          348|       srcSubDirPath = cleanSrc.root + cleanSrc.subDir;
          349|       inherit configFiles executableToolDepends exeName enableDWARF;
             |              ^
          350|       exePath = drv + "/bin/${exeName}";

       … while evaluating anonymous lambda

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/builder/shell-for.nix:111:37:

          110|   nativeBuildInputs = removeSelectedInputs
          111|     (uniqueWithName (lib.concatMap (c: c.executableToolDepends)
             |                                     ^
          112|       # When not using `exactDeps` cabal may try to build arbitrary dependencies

       … from call site

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/builder/shell-for.nix:111:22:

          110|   nativeBuildInputs = removeSelectedInputs
          111|     (uniqueWithName (lib.concatMap (c: c.executableToolDepends)
             |                      ^
          112|       # When not using `exactDeps` cabal may try to build arbitrary dependencies

       … while evaluating 'uniqueWithName'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/builder/shell-for.nix:103:20:

          102|   # Version of `lib.unique` that should be fast if the name attributes are unique
          103|   uniqueWithName = list:
             |                    ^
          104|     lib.concatMap lib.unique (

       … from call site

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/builder/shell-for.nix:111:6:

          110|   nativeBuildInputs = removeSelectedInputs
          111|     (uniqueWithName (lib.concatMap (c: c.executableToolDepends)
             |      ^
          112|       # When not using `exactDeps` cabal may try to build arbitrary dependencies

       … while evaluating the attribute 'nativeBuildInputs'

       at /nix/store/kkr6573gzfhakba4av3bd6nlg81nqqax-source/builder/shell-for.nix:173:5:

          172|       ++ mkDrvArgs.buildInputs or [];
          173|     nativeBuildInputs = [ ghcEnv ]
             |     ^
          174|       ++ nativeBuildInputs

       … while evaluating 'mergeInputs'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/pkgs/build-support/mkshell/default.nix:17:17:

           16| let
           17|   mergeInputs = name:
             |                 ^
           18|     (attrs.${name} or [ ]) ++

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/pkgs/build-support/mkshell/default.nix:37:36:

           36|   buildInputs = mergeInputs "buildInputs";
           37|   nativeBuildInputs = packages ++ (mergeInputs "nativeBuildInputs");
             |                                    ^
           38|   propagatedBuildInputs = mergeInputs "propagatedBuildInputs";

       … while evaluating 'imap1'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/lists.nix:117:14:

          116|   */
          117|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |              ^
          118|

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/trivial.nix:138:19:

          137|   */
          138|   flip = f: a: b: f b a;
             |                   ^
          139|

       … while evaluating 'flip'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/trivial.nix:138:16:

          137|   */
          138|   flip = f: a: b: f b a;
             |                ^
          139|

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/pkgs/stdenv/generic/make-derivation.nix:192:49:

          191|   checkDependencyList = checkDependencyList' [];
          192|   checkDependencyList' = positions: name: deps: lib.flip lib.imap1 deps (index: dep:
             |                                                 ^
          193|     if lib.isDerivation dep || isNull dep || builtins.typeOf dep == "string" || builtins.typeOf dep == "path" then dep

       … while evaluating 'checkDependencyList''

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/pkgs/stdenv/generic/make-derivation.nix:192:43:

          191|   checkDependencyList = checkDependencyList' [];
          192|   checkDependencyList' = positions: name: deps: lib.flip lib.imap1 deps (index: dep:
             |                                           ^
          193|     if lib.isDerivation dep || isNull dep || builtins.typeOf dep == "string" || builtins.typeOf dep == "path" then dep

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/pkgs/stdenv/generic/make-derivation.nix:212:41:

          211|       (map (drv: drv.__spliced.buildBuild or drv) (checkDependencyList "depsBuildBuild" depsBuildBuild))
          212|       (map (drv: drv.nativeDrv or drv) (checkDependencyList "nativeBuildInputs" nativeBuildInputs
             |                                         ^
          213|          ++ lib.optional separateDebugInfo' ../../build-support/setup-hooks/separate-debug-info.sh

       … while evaluating 'chooseDevOutputs'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/lib/attrsets.nix:609:22:

          608|   /* Pick the outputs of packages to place in buildInputs */
          609|   chooseDevOutputs = drvs: builtins.map getDev drvs;
             |                      ^
          610|

       … from call site

       … while evaluating anonymous lambda

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/pkgs/stdenv/generic/make-derivation.nix:253:32:

          252|   computedImpureHostDeps =
          253|     lib.unique (lib.concatMap (input: input.__propagatedImpureHostDeps or [])
             |                                ^
          254|       (stdenv.extraNativeBuildInputs

       … from call site

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/pkgs/stdenv/generic/make-derivation.nix:253:17:

          252|   computedImpureHostDeps =
          253|     lib.unique (lib.concatMap (input: input.__propagatedImpureHostDeps or [])
             |                 ^
          254|       (stdenv.extraNativeBuildInputs

       … while evaluating the attribute '__impureHostDeps' of the derivation 'ghc-shell-for-packages'

       at /nix/store/xxs457ajxj8fjm2shjmik6mdz2spyjzy-source/pkgs/stdenv/generic/make-derivation.nix:270:7:

          269|     // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
          270|       name =
             |       ^
          271|         let

On macOS Monterey 12.5.1

$ nix show-config
accept-flake-config = false
access-tokens = 
allow-dirty = true
allow-import-from-derivation = true
allow-symlinked-store = false
allow-unsafe-native-code-during-evaluation = false
allowed-impure-host-deps = /System/Library /bin/sh /dev /usr/lib
allowed-uris = 
allowed-users = @wheel danielherrera
auto-optimise-store = false
bash-prompt = 
bash-prompt-prefix = 
bash-prompt-suffix = 
build-hook = /run/current-system/sw/bin/nix __build-remote
build-poll-interval = 5
build-users-group = nixbld
builders = 
builders-use-substitutes = false
commit-lockfile-summary = 
compress-build-log = true
connect-timeout = 0
cores = 0
darwin-log-sandbox-violations = false
diff-hook = 
download-attempts = 5
download-speed = 0
enforce-determinism = true
eval-cache = true
experimental-features = flakes nix-command
extra-platforms = aarch64-darwin
fallback = false
flake-registry = https://channels.nixos.org/flake-registry.json
fsync-metadata = true
gc-reserved-space = 8388608
hashed-mirrors = 
http-connections = 25
http2 = true
ignore-try = false
impersonate-linux-26 = false
keep-build-log = true
keep-derivations = true
keep-env-derivations = false
keep-failed = false
keep-going = false
keep-outputs = true
log-lines = 10
max-build-log-size = 0
max-free = 18446744073709551615
max-jobs = 16
max-silent-time = 0
min-free = 0
min-free-check-interval = 5
nar-buffer-size = 33554432
narinfo-cache-negative-ttl = 3600
narinfo-cache-positive-ttl = 2592000
netrc-file = /Users/danielherrera/.config/nix/netrc
nix-path = /Users/danielherrera/.nix-defexpr/channels darwin-config=/Users/danielherrera/.nixpkgs/darwin-configuration.nix /nix/var/nix/profiles/per-user/root/channels
plugin-files = 
post-build-hook = 
pre-build-hook = 
preallocate-contents = false
print-missing = true
pure-eval = true
repeat = 0
require-sigs = true
restrict-eval = false
run-diff-hook = false
sandbox = false
sandbox-fallback = false
sandbox-paths = /System/Library/Frameworks /System/Library/PrivateFrameworks /bin/bash /bin/sh /private/tmp /private/var/tmp /usr/lib
secret-key-files = 
show-trace = false
stalled-download-timeout = 300
store = daemon
substitute = true
substituters = https://cache.nixos.org https://cache.nixos.org/ https://simspace-portal-suite.cachix.org https://cache.iog.io
sync-before-registering = false
system = x86_64-darwin
system-features = benchmark big-parallel nixos-test
tarball-ttl = 3600
timeout = 0
trace-function-calls = false
trace-verbose = false
trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= simspace-portal-suite.cachix.org-1:hI0/DKl88P2FUuptKIi/GDswSwMyWnPQmAMvmwSEc8o= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
trusted-substituters = 
trusted-users = root danielherrera
use-case-hack = true
use-registries = true
use-sqlite-wal = true
user-agent-suffix = 
warn-dirty = true

I can't show the whole code, the flake should be OK:

{
  description = "portal-suite flake";

  inputs.haskellNix.url = "github:input-output-hk/haskell.nix";
  # inputs.nixpkgs.follows = "haskellNix/nixpkgs-2205";
  # inputs.nixpkgs.follows = "haskellNix/nixpkgs-2211";
  inputs.nixpkgs.follows = "haskellNix/nixpkgs-unstable";
  inputs.nixpkgs-unstable.url = "github:nixos/nixpkgs";
  inputs.nixpkgs-nodejs.url = "github:nixos/nixpkgs/nixos-22.05";
  inputs.nixpkgsMinio.url = "github:nixos/nixpkgs?rev=3b15136f7473478d140b0b7622e7cfbe1b1705cf";
  inputs.nixpkgs-packer.url = "github:nixos/nixpkgs?rev=6fd3426230875fac44aa5fc4d6d03a70e5534971";
  inputs.nixpkgs-packer.flake = false;
  inputs.nixpkgs-ansible.url = "github:nixos/nixpkgs?rev=300ca8132b3012e370e2565fa67638baf0567ec9";
  inputs.nixpkgs-ansible.flake = false;
  inputs.stack2cabal.url = "github:Simspace/stack2cabal";

  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.flake-compat = {
    url = "github:edolstra/flake-compat";
    flake = false;
  };
  outputs = { self
            , nixpkgs
            , nixpkgs-unstable
            , flake-utils
            , haskellNix
            , flake-compat
            , nixpkgs-nodejs
            , nixpkgsMinio
            , nixpkgs-packer
            , nixpkgs-ansible
            , stack2cabal
            }:
    flake-utils.lib.eachSystem [ "x86_64-linux"  "x86_64-darwin" ] (system:
    let
      ps = import ./default.nix  { inherit
                                     system
                                     nixpkgs
                                     nixpkgs-unstable
                                     haskellNix
                                     nixpkgs-nodejs
                                     nixpkgsMinio
                                     nixpkgs-packer
                                     nixpkgs-ansible
                                     stack2cabal
                                     ;
                                 };
      flake = ps.project.flake {};
      mkDevShell = pkgNames: ps.project.shellFor({
        inherit system;
        withHoogle = false;
        # exactDeps = true; # TODO: Uncomment and have it work.
        tools = {
          haskell-language-server = {};
        };
        buildInputs = import ./nix/developer-packages.nix { inherit system; };
        packages = hsPkgs: map (p: hsPkgs."${p}") pkgNames;
        additional = hsPkgs: with hsPkgs; [ Cabal ghc ghc-lib-parser ];
      });
    in
      flake // {
      # Built by either:
      # - `nix build .`
      # - `nix-build nix/default-shim.nix`
      packages.default = ps.pkgs.runCommand "all-portal-suite-packages" { src = ./.; please-build-these = builtins.attrValues flake.packages;  } ''
        mkdir -p $out
        # Remove if output is an incoveniance.
        echo "all-portal-suite-packages success"
      '';
      # Try the development shell with either:
      # - `nix develop`
      # - `nix-shell nix/shell-shim.nix`
      devShell = mkDevShell [ ];
      # You can try custom shells with either (examples for quotas custom shell):
      # - `nix develop ".#quotas"`
      # - `nix-shell nix/shell-shim.nix -A devShells.x86_64-darwin.quotas # Or change darwin for linux`
      # With custom shells you can do things like (remember to comment/remove `flags: zip: disable-bzip2` in `stack.yaml`):
      #   ```
      #   $ nix develop ".#quotas" -c zsh
      #   $ stack ghci simspace-quota-api simspace-quota-db
      #   $ # profit
      #   ```
      devShells.quotas = mkDevShell [
        "simspace-quota-db"
        "simspace-quota-api"
        "simspace-quota-server"
        "simspace-quota-db-test"
      ];
    });
  # --- Flake Local Nix Configuration ----------------------------
  nixConfig = {
    # This sets the flake to use the IOG nix cache.
    # Nix should ask for permission before using it,
    # but remove it here if you do not want it to.
    extra-substituters = ["https://cache.iog.io"];
    extra-trusted-public-keys = ["hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="];
    allow-import-from-derivation = "true";
  };
}

[hhefesto]

adding happy to additional doesn't seem to have any effect