- let mut has_help = false;
- let mut handler = handler.struct_span_err(
- span_with_quotes,
- "character literal may only contain one codepoint",
- );
-
- if lit.chars().skip(1).all(|c| is_combining_mark(c)) {
- let escaped_marks =
- lit.chars().skip(1).map(|c| c.escape_default().to_string()).collect::<Vec<_>>();
- handler.span_note(
- span,
- &format!(
- "this `{}` is followed by the combining mark{} `{}`",
- lit.chars().next().unwrap(),
- pluralize!(escaped_marks.len()),
- escaped_marks.join(""),
- ),
- );
+ let lit_chars = lit.chars().collect::<Vec<_>>();
+ let (first, rest) = lit_chars.split_first().unwrap();
+ if rest.iter().copied().all(is_combining_mark) {