Trouble using nix-shell

[offendo]

Hello everyone,

I've never used nix before so apologies if the problem is basic.

I'm running the nix-shell command from the README to make a shell with CUDA 11 support.

❯ nix-shell --arg cudaSupport true --argstr cudaMajorVersion 11
error: cannot evaluate a function that has an argument without a value ('hasktorchProject')

       Nix attempted to evaluate a function as a top level expression; in
       this case it must have its arguments supplied either by default
       values, or passed explicitly with '--arg' or '--argstr'. See
       https://nixos.org/manual/nix/stable/#ss-functions.

       at /home/offendo/src/hasktorch/shell.nix:3:3:

            2| , cudaMajorVersion
            3| , hasktorchProject
             |   ^
            4| , torch

I tried adding --argstr hasktorchProject test just to see what happens, and then it complains about the next argument in the list.

I assume there's supposed to be arguments for each of the parameters, but I don't know what to give. Any help would be appreciated.

[junji hashimoto]

Hi,
Sorry for not updating README.
Could you take a look at this PR(https://github.com/hasktorch/hasktorch/pull/642/files), and try nix develop command?

[offendo]

I had to use the following command instead of nix develop, but then it worked!

nix --extra-experimental-features flakes  --extra-experimental-features nix-command develop

Much appreciated