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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/f6663a8449f5e4a7393aa24601600c8f6e352c97.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-2003;
# 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
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