# Bad Rust syntax highlighting

**URL:** <https://meta.discourse.org/t/bad-rust-syntax-highlighting/302236>\
**Category:** Bug\
**Created:** [April 3, 2024, 3:44pm UTC](https://meta.discourse.org/t/bad-rust-syntax-highlighting/302236 "2024-04-03T15:44:01Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![notriddle](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/notriddle/32/133055_2.png) [@notriddle](https://meta.discourse.org/u/notriddle)\
**Post date:** [April 3, 2024, 3:44pm UTC](https://meta.discourse.org/t/bad-rust-syntax-highlighting/302236/1 "2024-04-03T15:44:02Z")

</div>

Since [A display error of the forum - meta - The Rust Programming Language Forum](https://users.rust-lang.org/t/a-display-error-of-the-forum/109255) also happens on Meta, it looks like this is a problem in Discourse, not just our install.

```rust
#[derive(Parser)]
pub struct Arg {
  #[arg(short, long, default_values_t = [66,77])] // here, the brackets seems mismatched.
  pub(crate) arg1: Vec<u32>
}

```

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<div class="post-metadata">

**Author:** ![david](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/david/32/157490_2.png) [@david](https://meta.discourse.org/u/david)\
**Post date:** [April 3, 2024, 3:47pm UTC](https://meta.discourse.org/t/bad-rust-syntax-highlighting/302236/2 "2024-04-03T15:47:01Z")

</div>

Discourse uses [highlightjs.org](http://highlightjs.org) for syntax highlighting. I tried putting your snippet into their demo at [Demo - highlight.js](https://highlightjs.org/demo) and it seems like the same issue is present:

 ![SCR-20240403-oszk](https://global.discourse-cdn.com/meta/original/4X/7/2/2/722bbecf2dbaae211c14bc3d950cc944a856b7f1.png)

So the best thing is probably to [report the issue upstream](https://github.com/highlightjs/highlight.js/issues) to them (if there isn’t already a matching issue)

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<div class="post-metadata">

**Author:** ![notriddle](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/notriddle/32/133055_2.png) [@notriddle](https://meta.discourse.org/u/notriddle)\
**Post date:** [April 3, 2024, 4:15pm UTC](https://meta.discourse.org/t/bad-rust-syntax-highlighting/302236/3 "2024-04-03T16:15:22Z")

</div>

[https://github.com/highlightjs/highlight.js/issues/4032](https://github.com/highlightjs/highlight.js/issues/4032)