Function rustc_lexer::unescape::unescape_mixed

pub fn unescape_mixed<F>(src: &str, mode: Mode, callback: &mut F)
where
    F: FnMut(Range<usize>, Result<MixedUnit, EscapeError>),

Takes the contents of a mixed-utf8 literal (without quotes) and produces a sequence of escaped characters or errors.

Values are returned by invoking callback.