Panic with unmatched diagnostic pointing at unicode

[Alexendoo]

Add the following to tests/integrations/basic/tests/actual_tests:

#![deny(non_ascii_idents)]

fn main() {
    let 电脑 = 1;
}

It hits a panic

error: actual output differed from expected
Execute `cargo test` to update `tests/integrations/basic/Cargo.stderr` to the actual output
--- tests/integrations/basic/Cargo.stderr
+++ <stderr output>
+thread 'main' panicked at /home/gh-Alexendoo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/annotate-snippets-0.11.2/src/renderer/display_list.rs:LL:CC:
+byte index 10 is not a char boundary; it is inside '电' (bytes 8..11) of `    let 电脑 = 1;`

[oli-obk]

Yea already created a fix for that yesterday, but it needs cleaning up 😆