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Merge pull request #1548 from inblossoms/patch-1 

docs: update errors.md
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src/advance/errors.md
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@ -93,37 +93,6 @@ fn main() {
}
```
```rust
fn main() {
// and_then with Option
let s1 = Some("some1");
let s2 = Some("some2");
let fn_some = |_| Some("some2"); // 类似于: let fn_some = |_| -> Option<&str> { Some("some2") };
let n: Option<&str> = None;
let fn_none = |_| None;
assert_eq!(s1.and_then(fn_some), s2); // Some1 and_then Some2 = Some2
assert_eq!(s1.and_then(fn_none), n); // Some and_then None = None
assert_eq!(n.and_then(fn_some), n); // None and_then Some = None
assert_eq!(n.and_then(fn_none), n); // None1 and_then None2 = None1
// and_then with Result
let o1: Result<&str, &str> = Ok("ok1");
let o2: Result<&str, &str> = Ok("ok2");
let fn_ok = |_| Ok("ok2"); // 类似于: let fn_ok = |_| -> Result<&str, &str> { Ok("ok2") };
let e1: Result<&str, &str> = Err("error1");
let e2: Result<&str, &str> = Err("error2");
let fn_err = |_| Err("error2");
assert_eq!(o1.and_then(fn_ok), o2); // Ok1 and_then Ok2 = Ok2
assert_eq!(o1.and_then(fn_err), e2); // Ok and_then Err = Err
assert_eq!(e1.and_then(fn_ok), e1); // Err and_then Ok = Err
assert_eq!(e1.and_then(fn_err), e1); // Err1 and_then Err2 = Err1
}
```
#### filter
`filter` 用于对 `Option` 进行过滤：