{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//"}]}
            // Don't try to check items that cannot possibly constrain the type.
            let opaque_types_defined_by = self.tcx.opaque_types_defined_by(item_def_id);
            if !opaque_types_defined_by.contains(&self.opaque_def_id) {