building '/nix/store/2vjdf0xrl4c0gn5kki5gfxpila8pcl7d-cabal2nix-exploit-poker.drv'...
installing
unpacking...
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors
error: program 'tar' failed with exit code 2
error: unable to download '/nix/store/466a53bbd6c2x1wp8ikxb9mg7plhpar7-exploit-poker': URL using bad/illegal format or missing URL (3)
** need a revision for VCS when the hash is given. skipping.
** need a revision for VCS when the hash is given. skipping.
** need a revision for VCS when the hash is given. skipping.
** need a revision for VCS when the hash is given. skipping.
cabal2nix: user error (Failed to fetch source. Does this source exist? Source {sourceUrl = "/nix/store/466a53bbd6c2x1wp8ikxb9mg7plhpar7-exploit-poker", sourceRevision = "", sourceHash = Guess "", sourceCabalDir = ""})
builder for '/nix/store/2vjdf0xrl4c0gn5kki5gfxpila8pcl7d-cabal2nix-exploit-poker.drv' failed with exit code 1
error: build of '/nix/store/2vjdf0xrl4c0gn5kki5gfxpila8pcl7d-cabal2nix-exploit-poker.drv' failed