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parser: merge nested dynamic attributes

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Fixes https://github.com/NixOS/nix/issues/7115
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Naïm Favier 2023-07-08 12:28:13 +02:00
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19
doc/manual/src/release-notes/rl-next.md
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@ -6,3 +6,22 @@
- Nix now allows unprivileged/[`allowed-users`](../command-ref/conf-file.md#conf-allowed-users) to sign paths.
Previously, only [`trusted-users`](../command-ref/conf-file.md#conf-trusted-users) users could sign paths.
- Nested dynamic attributes are now merged correctly by the parser. For example:
```nix
{
nested = { foo = 1; };
nested = { ${"ba" + "r"} = 2; };
}
```
This used to silently discard `nested.bar`, but now behaves as one would expect and evaluates to:
```nix
{ nested = { bar = 2; foo = 1; }; }
```
Note that the feature of merging multiple attribute set declarations 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.