syntax_data: {"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let id = id.owner_id.def_id;
context_before:             fn visit_nested_item(&mut self, id: rustc_hir::ItemId) {
context_after:                 if let DefKind::TyAlias = self.collector.tcx.def_kind(id) {