There were some major breakages with 2.14 which blocked Nix updates in Nixpkgs for a while. 2.15 should work though, and in nix: 2.13.3 -> 2.15.1 by infinisil · Pull Request #233439 · NixOS/nixpkgs · GitHub it’s being made the default. 2.16 should still be further tested before it can be made the default though.
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