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# Release 2.10 (2022-07-11)

- `nix repl` now takes installables on the command line, unifying the usage with other commands that use `--file` and `--expr`. Primary breaking change is for the common usage of `nix repl '<nixpkgs>'` which can be recovered with `nix repl --file '<nixpkgs>'` or `nix repl --expr 'import <nixpkgs>{}'`.

  This is currently guarded by the `repl-flake` experimental feature.

- A new function `builtins.traceVerbose` is available. It is similar to `builtins.trace` if the `trace-verbose` setting is set to true, and it is a no-op otherwise.

- `nix search` has a new flag `--exclude` to filter out packages.

- On Linux, if `/nix` doesn't exist and cannot be created and you're not running as root, Nix will automatically use `~/.local/share/nix/root` as a chroot store. This enables non-root users to download the statically linked Nix binary and have it work out of the box, e.g.

      # ~/nix run nixpkgs#hello
      warning: '/nix' does not exists, so Nix will use '/home/ubuntu/.local/share/nix/root' as a chroot store
      Hello, world!

- `flake-registry.json` is now fetched from `channels.nixos.org`.

- Nix can now be built with LTO by passing `--enable-lto` to `configure`. LTO is currently only supported when building with GCC.