{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"debug!(\"check_ptr_ptr_cast"}]}
        debug!("check_ptr_ptr_cast m_src={m_src:?} m_dst={m_dst:?}");
    ) -> Result<CastKind, CastError<'tcx>> {
        // ptr-ptr cast. metadata must match.