{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"//"}]}
        // Don't try to check items that cannot possibly constrain the type.
        let opaque_types_defined_by = tcx.opaque_types_defined_by(item_def_id);
        if !opaque_types_defined_by.contains(&self.def_id) {