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fix an incorrect assertion in the doc example for std::io::copy #44712

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Sep 23, 2017
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fix an incorrect assertion in the doc example for std::io::copy #44712

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3 changes: 2 additions & 1 deletion src/libstd/io/util.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -40,9 +40,10 @@ use mem;
///
/// io::copy(&mut reader, &mut writer)?;
///
/// assert_eq!(reader, &writer[..]);
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reader is an empty slice at this point.

/// assert_eq!(&b"hello"[..], &writer[..]);
/// # Ok(())
/// # }
/// # foo().unwrap();
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn copy<R: ?Sized, W: ?Sized>(reader: &mut R, writer: &mut W) -> io::Result<u64>
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