user0/rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add negative example for Result::and_then

Browse source
This commit is contained in:
cyqsimon 2022-02-11 09:55:47 +08:00
parent bd421e2880
commit 942eaa7ffc
No known key found for this signature in database
GPG key ID: 1D8CE2F297390D65
1 changed files with 6 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

8
library/core/src/result.rs
View file

@ -1293,10 +1293,14 @@ impl<T, E> Result<T, E> {
/// Often used to chain fallible operations that may return [`Err`].
///
/// ```
/// use std::path::Path;
/// use std::{io::ErrorKind, path::Path};
///
/// let root_modified_time = Path::new("/").metadata().and_then(|md| md.modified());
/// assert!(root_modified_time.is_ok())
/// assert!(root_modified_time.is_ok());
///
/// let should_fail = Path::new("/bad/path").metadata().and_then(|md| md.modified());
/// assert!(should_fail.is_err());
/// assert_eq!(should_fail.unwrap_err().kind(), ErrorKind::NotFound);
/// ```
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]