{"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
                let lang_item = self.tcx.require_lang_item(LangItem::Sized, span);
                // We can't be sure, let's required full `Sized`.
                self.require_type_meets(ty, span, ObligationCauseCode::Misc, lang_item);