syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"self.tcx.def_key(field_def.did).disambiguated_data;"}]}
source_snippet:                                         self.tcx.def_key(field_def.did).disambiguated_data;
context_before:                                     let disambiguated_field =
context_after:                                     let field_name = disambiguated_field.data.get_opt_name();