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std: Add a note about the print! macro and output buffering #23826

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Mar 31, 2015
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std: Add a note about the print! macro and output buffering #23826

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4 changes: 4 additions & 0 deletions src/libstd/macros.rs
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Expand Up @@ -64,6 +64,10 @@ macro_rules! panic {
///
/// Equivalent to the `println!` macro except that a newline is not printed at
/// the end of the message.
///
/// Note that stdout is frequently line-buffered by default so it may be
/// necessary to use `io::stdout().flush()` to ensure the output is emitted
/// immediately.
#[macro_export]
#[stable(feature = "rust1", since = "1.0.0")]
#[allow_internal_unstable]
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