{"ast_node_type":"other","tokens":[{"end":18,"kind":"keyword","start":0,"text":"///"}]}
/// of the suffix.
/// `BB` is. Return the length of the prefix, the "trimmed" suggestion, and the length
fn as_substr<'a>(original: &'a str, suggestion: &'a str) -> Option<(usize, &'a str, usize)> {