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Add negative example for Result::and_then

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cyqsimon 2022-02-11 09:55:47 +08:00
parent bd421e2880
commit 942eaa7ffc
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1 changed files with 6 additions and 2 deletions
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8
library/core/src/result.rs
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@ -1293,10 +1293,14 @@ pub fn and<U>(self, res: Result<U, E>) -> Result<U, 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")]