❯ nix-build -A haskellPackages.liquidhaskell
this derivation will be built:
  /nix/store/n130lvvlqafx11lq2gmgg8gr5xsvh6mv-liquidhaskell-0.9.10.1.2.drv
building '/nix/store/n130lvvlqafx11lq2gmgg8gr5xsvh6mv-liquidhaskell-0.9.10.1.2.drv'...
Running phase: setupCompilerEnvironmentPhase
Build with /nix/store/a6ch4glhsgzpn9i9cqzpdlmbli5ylff7-ghc-9.10.2.
Running phase: unpackPhase
unpacking source archive /nix/store/g1wjnbnkrgcdh8wc4wx0g27k4p8v4ifn-liquidhaskell-0.9.10.1.2.tar.gz
source root is liquidhaskell-0.9.10.1.2
setting SOURCE_DATE_EPOCH to timestamp 1000000000 of file "liquidhaskell-0.9.10.1.2/src/Prelude_LHAssumptions.hs"
Running phase: patchPhase
Running phase: compileBuildDriverPhase
setupCompileFlags: -package-db=/build/tmp.2rh53Ciwyp/setup-package.conf.d -threaded
[1 of 2] Compiling Main             ( Setup.hs, /build/tmp.2rh53Ciwyp/Main.o )
Setup.hs:3:1: error: [GHC-87110]
    Could not find module ‘Language.Haskell.Liquid.Cabal’.
    Use -v to see a list of the files searched for.
  |
3 | import Language.Haskell.Liquid.Cabal (liquidHaskellMain)
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: builder for '/nix/store/n130lvvlqafx11lq2gmgg8gr5xsvh6mv-liquidhaskell-0.9.10.1.2.drv' failed with exit code 1;
       last 17 log lines:
       > Running phase: setupCompilerEnvironmentPhase
       > Build with /nix/store/a6ch4glhsgzpn9i9cqzpdlmbli5ylff7-ghc-9.10.2.
       > Running phase: unpackPhase
       > unpacking source archive /nix/store/g1wjnbnkrgcdh8wc4wx0g27k4p8v4ifn-liquidhaskell-0.9.10.1.2.tar.gz
       > source root is liquidhaskell-0.9.10.1.2
       > setting SOURCE_DATE_EPOCH to timestamp 1000000000 of file "liquidhaskell-0.9.10.1.2/src/Prelude_LHAssumptions.hs"
       > Running phase: patchPhase
       > Running phase: compileBuildDriverPhase
       > setupCompileFlags: -package-db=/build/tmp.2rh53Ciwyp/setup-package.conf.d -threaded
       > [1 of 2] Compiling Main             ( Setup.hs, /build/tmp.2rh53Ciwyp/Main.o )
       > Setup.hs:3:1: error: [GHC-87110]
       >     Could not find module ‘Language.Haskell.Liquid.Cabal’.
       >     Use -v to see a list of the files searched for.
       >   |
       > 3 | import Language.Haskell.Liquid.Cabal (liquidHaskellMain)
       >   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       >
       For full logs, run:
         nix log /nix/store/n130lvvlqafx11lq2gmgg8gr5xsvh6mv-liquidhaskell-0.9.10.1.2.drv

❯  nix log /nix/store/n130lvvlqafx11lq2gmgg8gr5xsvh6mv-liquidhaskell-0.9.10.1.2.drv
Running phase: setupCompilerEnvironmentPhase
@nix { "action": "setPhase", "phase": "setupCompilerEnvironmentPhase" }
Build with /nix/store/a6ch4glhsgzpn9i9cqzpdlmbli5ylff7-ghc-9.10.2.
Running phase: unpackPhase
@nix { "action": "setPhase", "phase": "unpackPhase" }
unpacking source archive /nix/store/g1wjnbnkrgcdh8wc4wx0g27k4p8v4ifn-liquidhaskell-0.9.10.1.2.tar.gz
source root is liquidhaskell-0.9.10.1.2
setting SOURCE_DATE_EPOCH to timestamp 1000000000 of file "liquidhaskell-0.9.10.1.2/src/Prelude_LHAssumptions.hs"
Running phase: patchPhase
@nix { "action": "setPhase", "phase": "patchPhase" }
Running phase: compileBuildDriverPhase
@nix { "action": "setPhase", "phase": "compileBuildDriverPhase" }
setupCompileFlags: -package-db=/build/tmp.2rh53Ciwyp/setup-package.conf.d -threaded
[1 of 2] Compiling Main             ( Setup.hs, /build/tmp.2rh53Ciwyp/Main.o )
Setup.hs:3:1: error: [GHC-87110]
    Could not find module ‘Language.Haskell.Liquid.Cabal’.
    Use -v to see a list of the files searched for.
  |
3 | import Language.Haskell.Liquid.Cabal (liquidHaskellMain)
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

In reply to @artem.types:matrix.org
how good is the Haskell builder with custom setups? I'm getting a pretty basic error when a custom setup uses a function from another package, and that package is listed in the cabal file's custom-setup:setup-depends, but when I'm building it with Nix, I'm getting "module not found" on the import-line in Setup.hs for an import from that other package.
That's liquidhaskell, by the way. The import line is here: https://github.com/ucsd-progsys/liquidhaskell/blob/6baa675f6bb000d016f0c859d7f865263679dc43/Setup.hs#L3 and it comes from the liquidhaskell-boot package. I am building it on top of my branch from https://github.com/NixOS/nixpkgs/pull/433722 (with nix-build -A haskellPackages.liquidhaskell): I just enabled liquidhaskell and liquidhaskell-boot on top of the packages that are enabled in that PR. This should be the entirety of the dependency tree of liquidhaskell...

what is the better commit message / PR title for a nixpkgs PR:

haskellPackages.{liquidhaskell, liqquidhaskell-boot, liquid-fixpoint, smtlib-backends-process, smtlib-backends-tests}: unbreak

or

haskellPackages.liquidhaskell and dependencies: unbreak

what is the better commit message / PR title for a nixpkgs PR:

haskellPackages.{liquidhaskell, liqquidhaskell-boot, liquid-fixpoint, smtlib-backends-process, smtlib-backends-tests}: unbreak

or

haskellPackages.liquidhaskell and dependencies: unbreak

?

In reply to @kephaspierre:matrix.org
I've looked at documentation and source code but I don't see how I can use developPackage and add additional packages to the environment (ideally they would only be added when using a shell). I guess that's done with the modifier attribute?