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haskell.nix/docs/dev/nixpkgs-pin.md
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1# Haskell.nix Nixpkgs Pin
3Haskell.nix contains several Nixpkgs pins imanaged by `niv` in
4`nix/sources.json`.
6These are used in testing various versions of nixpkgs.
8To use haskell.nix the `config` and `overlays` need to be applied to
9Nixpkgs. Users should probably pin a suitable version of nixpkgs, although things might not work for them if their Nixpkgs version is
10too different.
12We aim to keep this pin somewhere on a channel of the **Nixpkgs latest
13stable release**. That is currently 20.09.
15We also execute tests on MacOS (darwin). The darwin channel is usually
16behind the NixOS channel. So we follow the `nixpkgs-20.09-darwin`
17channel.