attribute 'ghc822' missing
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emacsomancer commented
$ nix-env -f default.nix -i --show-trace
error: while evaluating anonymous function at /home/slade/Documents/sourcecode/twidlk/default.nix:1:1, called from undefined position:
while evaluating the attribute 'haskell.packages.ghc822.callPackage' at /nix/store/0b1g7as1v6affssqrsmq4bbwk418ajxq-nixpkgs-20.03pre210728.42a195919a1/nixpkgs/pkgs/top-level/haskell-packages.nix:106:3:
attribute 'ghc822' missing, at /home/slade/Documents/sourcecode/twidlk/default.nix:3:1
Not sure how to resolve.