Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

doc: note that @-pattern is accessible in default values #11672

Open
wants to merge 5 commits into
base: master
Choose a base branch
from
+20 −0
Open

doc: note that @-pattern is accessible in default values #11672

Changes from all commits
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
a780ce4
doc: note that @-pattern is accessible in default values
fricklerhandwerk Oct 10, 2024
8416960
technically correct terminology
fricklerhandwerk Oct 11, 2024
a2fd23f
Update doc/manual/src/language/syntax.md
fricklerhandwerk Oct 11, 2024
e102ff7
Update doc/manual/src/language/syntax.md
Mic92 Oct 22, 2024
ebb3243
split general description and text related to the example
fricklerhandwerk Oct 30, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
20 changes: 20 additions & 0 deletions doc/manual/src/language/syntax.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -503,6 +503,26 @@ three kinds of patterns:
> [ 23 {} ]
> ```

All bindings introduced by the function are in scope in the entire function expression; not just in the body.
It can therefore be used in default values.

> **Example**
>
> The binding of an `@` pattern is available in the `?`-defaults:
>
> ```nix
> let
> f = args@{ x ? args.a, ... }: x;
> in
> f { a = 1; }
> ```
>
> evaluates to
>
> ```nix
> 1
> ```

Note that functions do not have names. If you want to give them a name,
you can bind them to an attribute, e.g.,

Expand Down