syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let adt_def = self.tcx.adt_def(enum_id);
context_before:                 let enum_id = self.tcx.parent(variant_id);
context_after:                 if adt_def.is_enum() {