syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"d.insert(self.link_self_contained.json_key().into(),"}]}
source_snippet:         d.insert(self.link_self_contained.json_key().into(), self.link_self_contained.to_json());
context_before:         // backwards-compatible variants.