Panic in char index

[GuillaumeGomez]

While working on rust-lang/rust-clippy#11421, I encountered this error:

thread 'main' panicked at /home/imperio/.cargo/registry/src/index.crates.io-6f17d22bba15001f/annotate-snippets-0.11.4/src/renderer/display_list.rs:1103:29:
byte index 18 is not a char boundary; it is inside '脑' (bytes 16..19) of `    let _ = "电脑\0".as_ptr();`
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

with this code:

fn main() {
    let _ = "电脑\0".as_ptr();
    //~^ clippy::manual_c_str_literals
}

I would have loved to send a fix but I couldn't figure out how to add a test. ^^'

[oli-obk]

I had seen some ui test issues like that but I thought I fixed them once and for all. Maybe the fix isn't published and used in clippy yet

[oli-obk]

definitely not annotate-snippets' fault, so closing