syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"self.syntax_context_map.insert(key,"}]}
source_snippet:         self.syntax_context_map.insert(key, ctxt);
context_before:             .push(SyntaxContextData { dollar_crate_name: sym::dummy, ..SyntaxContextData::root() });