syntax_data: {"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let next_source = next_source.split(c).next().unwrap_or("");
context_before:         if let Ok(next_source) = self.span_to_next_source(sp) {
context_after:             if !next_source.is_empty() && (accept_newlines || !next_source.contains('\n')) {