syntax_data: {"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"Ok(s)"}]}
source_snippet:             Ok(s) => s.rsplit_once('\n').unwrap_or(("", &s)).1.trim_start().is_empty(),
context_before:         match self.span_to_prev_source(sp) {
context_after:             Err(_) => false,