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let
# Fetch the latest haskell.nix and import its default.nix
haskellNix = import
(builtins.fetchTarball {
url = "https://github.com/input-output-hk/haskell.nix/archive/cc40a24585ccba274dc9a5af96d5506034e0d658.tar.gz";
})
{ };
# haskell.nix provides access to the nixpkgs pins which are used by our CI,
# hence you will be more likely to get cache hits when using these.
# But you can also just use your own, e.g. '<nixpkgs>'.
nixpkgsSrc = haskellNix.sources.nixpkgs-2111;
# haskell.nix provides some arguments to be passed to nixpkgs, including some
# patches and also the haskell.nix functionality itself as an overlay.
nixpkgsArgs = haskellNix.nixpkgsArgs;
# import nixpkgs with overlays
in
import nixpkgsSrc nixpkgsArgs
|
