error[E0412]: cannot find type `Result` in this scope
   --> C:\Users\qzl\.cargo\registry\src\mirrors.tuna.tsinghua.edu.cn-2eab394af869c8a2\embedded-hal-1.0.0\src\spi.rs:503:28
    |
503 |     fn flush(&mut self) -> Result<(), Self::Error> {
    |                            ^^^^^^ not found in this scope