{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"///"}]}
    /// about these dereferences, so we let it compute them as needed.
    /// environment and upvar reference as appropriate. Only regionck cares
    fn cat_upvar(&self, hir_id: HirId, var_id: HirId) -> Result<PlaceWithHirId<'tcx>, Cx::Error> {