Is syntax "<<" deprecated, or am I experiencing a bug

As you can see here:

when I use the syntax << in the line

let min_hash = BigUint::one() << (256 - 4 * LEADING_ZEROS);

visual studio code makes a mess out of my theme colors.

Am I making an error here or is this a bug of some sort?

Apologies if this is the wrong place to ask.

What extension for Rust do you use? The problem is probably there.

Which Rust plugin are you using? This displays fine with Rust Analyzer.

I was using plain old RLS via the Rust plugin from Rust-Lang, but installing Rust Analyzer seems to have fixed it. Where would one report this error, as an issue on git or is there somewhere more appropriate?

You can report it against the RLS repository.

Thanks, will do.