syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let or_span = candidate.or_span.take().unwrap();
context_before:         // This candidate is about to become a leaf, so unset `or_span`.
context_after:         let source_info = self.source_info(or_span);