{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"rustc_ast::BoundPolarity::Positive"}]}
            rustc_ast::BoundPolarity::Positive
        let (polarity, bounds) = match polarity {
                if tcx.is_lang_item(trait_def_id, hir::LangItem::PointeeSized) =>