Broken syntax highlighting after any local macro

[grunweg]

Follow-up to #6793. This is probably a duplicate of #1559; feel free to close in that case.
(Filing this also so I can reference this bug with the itertools crate.)

After any occurrence of the itertools::iproduct! macro, there is no more syntax highlighting for remainder of the file.
Tested with the 2020-12-07 release, but probably happens on any version after be50908.

Example code

// add itertools="0.9.0" to the Cargo.toml file
// main.rs has this
use itertools::iproduct;
fn main() {
    let t = ["toast", "bread"];
    for (a, b) in itertools::iproduct!(t.iter(), t.iter()) {
        println!("{}, {}", a, b);
    }
}

Expected
Syntax highlighting works normally for the whole file.

Actual
No syntax highlighting after line 3.

Thanks for your time!

[grunweg]

Never mind; I figured out how to resolve this myself: replacing the call to itertools::iproduct! by iproduct! restores syntax highlighting.

[lnicola]

I can't reproduce this on master:

Do you have any errors in Atom LSP logs? Does Atom even support semantic highlighting? If not, it's probably an Atom issue.

[grunweg]

How do I enable Atom LSP logs?

[lnicola]

No idea, I couldn't find much on Google. VS Code has a panel called Output. Does it still happen if you disable rust-analyzer?