Highlight settings for Rust type overlay?

[santoso-wijaya]

What is the highlight setting names for Rust's type annotation overlays?

By default, they are set to a lighter shade of the theme's yellow. But it's (1) not light enough and (2) easily confused with the actual code content. I'd like to override to something like even lighter grey, but I'm not sure what the highlight setting names are?

How do you usually discover these, in general, anyway?

---

Screenshot:

For the code snippet:

fn main() {
    App::new()
        .add_systems(Startup, hello_world)
        .run();

(see the lighter yellow App, schedule: , systems: and &mut App annotations? They're just overlays and don't actually exist in the code proper. They're highlighted as lighter yellow but not distinguishable enough, IMO. Since they're overlays, they should be even lighter, to begin with)

[santoso-wijaya]

I think I found the settings here?