qyriad/lix
1
0
Fork 0
forked from lix-project/lix
Code Pull requests Activity

doc: clarify release notes about nested attribute merges

Browse source
This commit is contained in:
Naïm Favier 2023-07-25 15:51:15 +02:00
parent ae3a7d6eba
commit 1b756e300f
No known key found for this signature in database
GPG key ID: 95AFCE8211908325
1 changed files with 16 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
doc/manual/src/release-notes/rl-2.17.md
View file

@ -11,8 +11,12 @@
```nix
{
nested = { foo = 1; };
nested = { ${"ba" + "r"} = 2; };
nested = {
foo = 1;
};
nested = {
${"ba" + "r"} = 2;
};
}
```
@ -22,8 +26,17 @@
{ nested = { bar = 2; foo = 1; }; }
```
Note that the feature of merging multiple attribute set declarations is of questionable value.
Note that the feature of merging multiple *full declarations* of attribute sets like `nested` in the example is of questionable value.
It allows writing expressions that are very hard to read, for instance when there are many lines of code between two declarations of the same attribute.
This has been around for a long time and is therefore supported for backwards compatibility, but should not be relied upon.
Instead, consider using the *nested attribute path* syntax:
```nix
{
nested.foo = 1;
nested.${"ba" + "r"} = 2;
}
```
* Tarball flakes can now redirect to an "immutable" URL that will be recorded in lock files. This allows the use of "mutable" tarball URLs like `https://example.org/hello/latest.tar.gz` in flakes. See the [tarball fetcher](../protocols/tarball-fetcher.md) for details.