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Add release notes for "Functions are printed with more detail"

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(cherry picked from commit abb5fef355)
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Rebecca Turner 2024-02-05 12:33:58 -08:00 committed by Maximilian Bosch
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doc/manual/src/release-notes/rl-2.20.md
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@ -167,6 +167,25 @@
error: expected a set but found an integer
```
- Functions are printed with more detail [#7145](https://github.com/NixOS/nix/issues/7145) [#9606](https://github.com/NixOS/nix/pull/9606)
`nix repl`, `nix eval`, `builtins.trace`, and most other places values are
printed will now include function names and source location information:
```
$ nix repl nixpkgs
nix-repl> builtins.map
«primop map»
nix-repl> builtins.map lib.id
«partially applied primop map»
nix-repl> builtins.trace lib.id "my-value"
trace: «lambda id @ /nix/store/8rrzq23h2zq7sv5l2vhw44kls5w0f654-source/lib/trivial.nix:26:5»
"my-value"
```
- Flake operations like `nix develop` will no longer fail when run in a Git
repository where the `flake.lock` file is `.gitignore`d
[#8854](https://github.com/NixOS/nix/issues/8854)