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Add #[must_use] to stdin/stdout/stderr locks #89693

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merged 1 commit into from
Oct 9, 2021
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Add #[must_use] to stdin/stdout/stderr locks #89693

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3 changes: 3 additions & 0 deletions library/std/src/io/stdio.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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>>,
Expand Down Expand Up @@ -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>>>,
Expand Down Expand Up @@ -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>>,
Expand Down