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Merge remote-tracking branch 'upstream/master' into indexed-store-path-outputs

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doc/manual/src/release-notes/rl-next.md
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# Release X.Y (202?-??-??)
* Nix now provides better integration with zsh's run-help feature. It is now
included in the Nix installation in the form of an autoloadable shell
function, run-help-nix. It picks up Nix subcommands from the currently typed
in command and directs the user to the associated man pages.
* `nix repl` has a new build-'n-link (`:bl`) command that builds a derivation
while creating GC root symlinks.
* The path produced by `builtins.toFile` is now allowed to be imported or read
even with restricted evaluation. Note that this will not work with a
read-only store.
* `nix build` has a new `--print-out-paths` flag to print the resulting output paths.
This matches the default behaviour of `nix-build`.
* You can now specify which outputs of a derivation `nix` should
operate on using the syntax `installable^outputs`,
e.g. `nixpkgs#glibc^dev,static` or `nixpkgs#glibc^*`. By default,
`nix` will use the outputs specified by the derivation's
`meta.outputsToInstall` attribute if it exists, or all outputs
otherwise.
Selecting derivation outputs using the attribute selection syntax
(e.g. `nixpkgs#glibc.dev`) no longer works.
* Nix can now be built with LTO by passing `--enable-lto` to `configure`.
LTO is currently only supported when building with GCC.
* Add experimental *indexed store derivations* installable syntax, part of the
the `computed-derivations` experimental feature.