syntax_data: {"ast_node_type":"function","tokens":[{"end":80,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn find_width_of_character_at_span(&self, sp: Span, forwards: bool) -> u32 {
context_before:     #[instrument(skip(self, sp))]
context_after:         let sp = sp.data();