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# Release 2.8 (2022-04-19)
* New experimental command: `nix fmt`, which applies a formatter
defined by the `formatter.<system>` flake output to the Nix
expressions in a flake.
* Various Nix commands can now read expressions from standard input
using `--file -`.
* New experimental builtin function `builtins.fetchClosure` that
copies a closure from a binary cache at evaluation time and rewrites
it to content-addressed form (if it isn't already). Like
`builtins.storePath`, this allows importing pre-built store paths;
the difference is that it doesn't require the user to configure
binary caches and trusted public keys.
This function is only available if you enable the experimental
feature `fetch-closure`.
* New experimental feature: *impure derivations*. These are
derivations that can produce a different result every time they're
built. Here is an example:
```nix
stdenv.mkDerivation {
name = "impure";
__impure = true; # marks this derivation as impure
buildCommand = "date > $out";
}
```
Running `nix build` twice on this expression will build the
derivation twice, producing two different content-addressed store
paths. Like fixed-output derivations, impure derivations have access
to the network. Only fixed-output derivations and impure derivations
can depend on an impure derivation.
* `nix store make-content-addressable` has been renamed to `nix store
make-content-addressed`.
* The `nixosModule` flake output attribute has been renamed consistent
with the `.default` renames in Nix 2.7.
* `nixosModule` → `nixosModules.default`
As before, the old output will continue to work, but `nix flake check` will
issue a warning about it.
* `nix run` is now stricter in what it accepts: members of the `apps`
flake output are now required to be apps (as defined in [the
manual](https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-run.html#apps)),
and members of `packages` or `legacyPackages` must be derivations
(not apps).
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