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# Description
Built-in commands can have parameter of `SyntaxShape::OneOf`.
This PR changes `OneOf`'s string representation and gives users the
ability to use it in definitions.
> _Syntax updated after discussion on discord._
```nushell
def foo [
param: oneof<binary, string>
] { .. }
```
```
Usage:
> foo <param>
Flags:
-h, --help: Display the help message for this command
Parameters:
param <oneof<binary, string>>
Input/output types:
╭───┬───────┬────────╮
│ # │ input │ output │
├───┼───────┼────────┤
│ 0 │ any │ any │
╰───┴───────┴────────╯
```
<details><summary>Previous iterations</summary>
<p>
> ```nushell
> def foo [
> param: (binary | string)
> ] { .. }
> ```
> ---
>
> ```nushell
> def foo [
> param: one_of(binary, string)
> ] { .. }
> ```
</p>
</details>
# User-Facing Changes
# Tests + Formatting
Added some test cases.
- 🟢 toolkit fmt
- 🟢 toolkit clippy
- 🟢 toolkit test
- 🟢 toolkit test stdlib
# After Submitting
- Update the website to include the new syntax
[here](https://github.com/nushell/nushell.github.io/blob/main/book/custom_commands.md)
- Update [tree-sitter-nu](https://github.com/nushell/tree-sitter-nu)
- Update `std` and `std-rfc` where applicable
---------
Co-authored-by: Bahex <17417311+Bahex@users.noreply.github.com>
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| .. | ||
| assets/nu_json | ||
| const_ | ||
| eval | ||
| fixtures | ||
| hooks | ||
| modules | ||
| overlays | ||
| parsing | ||
| path | ||
| plugin_persistence | ||
| plugins | ||
| repl | ||
| scope | ||
| shell | ||
| main.rs | ||