hask@LAPTOP-PQ3KPQAO:~/helloWorld$ nix-build -A Hello
building '/nix/store/7sv8il09w4ja9v7q9129nh5hgiqivwar-cabal2nix-Hello.drv'...
installing
unpacking...//nix/store/7fi0gy5y90rqklchi7mwc5acbgqykb46-Hello'
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/7fi0gy5y90rqklchi7mwc5acbgqykb46-Hello': 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/7fi0gy5y90rqklchi7mwc5acbgqykb46-Hello", sourceRevision = "", sourceHash = Guess "", sourceCabalDir = ""})
builder for '/nix/store/7sv8il09w4ja9v7q9129nh5hgiqivwar-cabal2nix-Hello.drv' failed with exit code 1
error: build of '/nix/store/7sv8il09w4ja9v7q9129nh5hgiqivwar-cabal2nix-Hello.drv' failed