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

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Rebecca Turner 2024-02-05 12:33:58 -08:00
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50
doc/manual/rl-next/lambda-printing.md Normal file
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---
synopsis: Functions are printed with more detail
prs: 9606
issues: 7145
---
Functions and `builtins` are printed with more detail in `nix repl`, `nix
eval`, `builtins.trace`, and most other places values are printed.
Before:
```
$ nix repl nixpkgs
nix-repl> builtins.map
«primop»
nix-repl> builtins.map lib.id
«primop-app»
nix-repl> builtins.trace lib.id "my-value"
trace: <LAMBDA>
"my-value"
$ nix eval --file functions.nix
{ id = <LAMBDA>; primop = <PRIMOP>; primop-app = <PRIMOP-APP>; }
```
After:
```
$ 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"
$ nix eval --file functions.nix
{ id = «lambda id @ /Users/wiggles/nix/functions.nix:2:8»; primop = «primop map»; primop-app = «partially applied primop map»; }
```
This was actually released in Nix 2.20, but wasn't added to the release notes
so we're announcing it here. The historical release notes have been updated as well.
[type-error]: https://github.com/NixOS/nix/pull/9753
[coercion-error]: https://github.com/NixOS/nix/pull/9754

19
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)