pub fn is_io(&self) -> bool {
        match self {
            RpcError::IoError(_) => true,
            _ => false,
        }
    }
/// Return True if the `RpcError` contains an IO Error.
Return True if the `RpcError` contains an IO Error.
Return True if the ` RpcError ` contains an IO Error .
pub fn is_io(&self) -> bool {
        match self {
            RpcError::IoError(_) => true,
            _ => false,
        }
    }
pub fn is_io ( & self ) -> bool { match self { RpcError :: IoError ( _ ) => true , _ => false , } }
Return True if the `RpcError` contains an IO Error.
Return True if the ` RpcError ` contains an IO Error .
&self
&self