Can't upload to hackage: Duplicate module found

[stites]

I have an exposed module which is exported conditionally with a cabal flag with a cabal file that is generated via the dhall-lang/dhall-to-cabal project (latest version: 1.3.1.0). The output of dhall-to-cabal compiles to cabal perfectly fine and I can build the project with cabal v2-build, but when attempting to upload a Package Candidate, I get Duplicate modules in library: Torch.FFI.TH.NN.Double.

Is there a mismatch between cabal and hackage-server that needs to be addressed or should I be filing an issue at the dhall-to-cabal repo?

[gbaz]

Building the project with cabal does not force the full range of checks. You should see if it comes up clean on a local `cabal check` with a current/recent cabal.

[hvr]

@stites does your package description by any chance have this form here: haskell/cabal#4629 ?

[stites]

@gbaz -- Thanks for letting me know! cabal check does find this error and I was unaware of this feature!

--

@hvr -- Yes, that is exactly the issue. The generated cabal file looks something like:

    if flag(lite)
        
        if flag(with_nn)
            exposed-modules:
                Torch.FFI.TH.NN.Double
        else
    else
        ...
        if flag(with_nn)
            exposed-modules:
                Torch.FFI.TH.NN.Float
                Torch.FFI.TH.NN.Double
        else

I'll close this now since it is just a duplicate of haskell/cabal#4629