{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"None"}]}
            None => Err(CastError::UnknownCastPtrKind),
        match fcx.pointer_kind(m_cast.ty, self.span)? {
            Some(PointerKind::Thin) => Ok(CastKind::AddrPtrCast),