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# Release 2.13 (2023-01-17)

- The `repeat` and `enforce-determinism` options have been removed since they had been broken under many circumstances for a long time.

- You can now use flake references in the old command line interface, e.g.

      # nix-build flake:nixpkgs -A hello
      # nix-build -I nixpkgs=flake:github:NixOS/nixpkgs/nixos-22.05 \
          '<nixpkgs>' -A hello
      # NIX_PATH=nixpkgs=flake:nixpkgs nix-build '<nixpkgs>' -A hello

- Instead of "antiquotation", the more common term string interpolation is now used consistently. Historical release notes were not changed.

- Error traces have been reworked to provide detailed explanations and more accurate error locations. A short excerpt of the trace is now shown by default when an error occurs.

- Allow explicitly selecting outputs in a store derivation installable, just like we can do with other sorts of installables. For example,

      # nix build /nix/store/gzaflydcr6sb3567hap9q6srzx8ggdgg-glibc-2.33-78.drv^dev

  now works just as

      # nix build nixpkgs#glibc^dev

  does already.

- On Linux, `nix develop` now sets the personality for the development shell in the same way as the actual build of the derivation. This makes shells for `i686-linux` derivations work correctly on `x86_64-linux`.

- You can now disable the global flake registry by setting the `flake-registry` configuration option to an empty string. The same can be achieved at runtime with `--flake-registry ""`.