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Document that std::io::BufReader discards contents on drop #59472

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Mar 28, 2019
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Document that std::io::BufReader discards contents on drop #59472

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4 changes: 4 additions & 0 deletions src/libstd/io/buffered.rs
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Expand Up @@ -21,6 +21,10 @@ use crate::memchr;
/// times. It also provides no advantage when reading from a source that is
/// already in memory, like a `Vec<u8>`.
///
/// When the `BufReader` is dropped, the contents of its buffer will be
/// discarded. Creating multiple instances of a `BufReader` on the same
/// stream can cause data loss.
///
/// [`Read`]: ../../std/io/trait.Read.html
/// [`TcpStream::read`]: ../../std/net/struct.TcpStream.html#method.read
/// [`TcpStream`]: ../../std/net/struct.TcpStream.html
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