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Add #[must_use] to stdin/stdout/stderr locks

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This commit is contained in:
John Kugelman 2021-10-08 23:31:57 -04:00
parent f8751436ff
commit e27bfb6e23
1 changed files with 3 additions and 0 deletions
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3
library/std/src/io/stdio.rs
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@ -256,6 +256,7 @@ pub struct Stdin {
/// Ok(())
/// }
/// ```
#[must_use = "if unused stdin will immediately unlock"]
#[stable(feature = "rust1", since = "1.0.0")]
pub struct StdinLock<'a> {
inner: MutexGuard<'a, BufReader<StdinRaw>>,
@ -624,6 +625,7 @@ pub struct Stdout {
/// When operating in a console, the Windows implementation of this stream does not support
/// non-UTF-8 byte sequences. Attempting to write bytes that are not valid UTF-8 will return
/// an error.
#[must_use = "if unused stdout will immediately unlock"]
#[stable(feature = "rust1", since = "1.0.0")]
pub struct StdoutLock<'a> {
inner: ReentrantMutexGuard<'a, RefCell<LineWriter<StdoutRaw>>>,
@ -907,6 +909,7 @@ pub struct Stderr {
/// When operating in a console, the Windows implementation of this stream does not support
/// non-UTF-8 byte sequences. Attempting to write bytes that are not valid UTF-8 will return
/// an error.
#[must_use = "if unused stderr will immediately unlock"]
#[stable(feature = "rust1", since = "1.0.0")]
pub struct StderrLock<'a> {
inner: ReentrantMutexGuard<'a, RefCell<StderrRaw>>,