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Branch 2.9 release notes

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doc/manual/src/SUMMARY.md.in
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- [CLI guideline](contributing/cli-guideline.md)
- [Release Notes](release-notes/release-notes.md)
- [Release X.Y (202?-??-??)](release-notes/rl-next.md)
- [Release 2.9 (2022-05-30)](release-notes/rl-2.9.md)
- [Release 2.8 (2022-04-19)](release-notes/rl-2.8.md)
- [Release 2.7 (2022-03-07)](release-notes/rl-2.7.md)
- [Release 2.6 (2022-01-24)](release-notes/rl-2.6.md)

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# Release 2.9 (2022-05-30)
* Running Nix with the new `--debugger` flag will cause it to start a
repl session if if an exception is thrown during evaluation, or if
`builtins.break` is called. From there you can inspect the values
of variables and evaluate Nix expressions. In debug mode, the
following new repl commands are available:
```
:env Show env stack
:bt Show trace stack
:st Show current trace
:st <idx> Change to another trace in the stack
:c Go until end of program, exception, or builtins.break().
:s Go one step
```
Read more about the debugger
[here](https://www.zknotes.com/note/5970).
* 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-and-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.
* `builtins.fetchTree` (and flake inputs) can now be used to fetch
plain files over the `http(s)` and `file` protocols in addition to
directory tarballs.

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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.
* Running nix with the new `--debugger` flag will cause it to start a repl session if
there is an exception thrown during eval, or if `builtins.break` is called. From
there one can inspect symbol values and evaluate nix expressions. In debug mode
the following new repl commands are available:
```
:env Show env stack
:bt Show trace stack
:st Show current trace
:st <idx> Change to another trace in the stack
:c Go until end of program, exception, or builtins.break().
:s Go one step
```
* `builtins.fetchTree` (and flake inputs) can now be used to fetch plain files
over the `http(s)` and `file` protocols in addition to directory tarballs.