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Diffstat (limited to 'src/liballoc')
| -rw-r--r-- | src/liballoc/borrow.rs | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/liballoc/borrow.rs b/src/liballoc/borrow.rs index acae0daa86b..c6741ddb822 100644 --- a/src/liballoc/borrow.rs +++ b/src/liballoc/borrow.rs @@ -59,6 +59,7 @@ pub trait ToOwned { /// let vv: Vec<i32> = v.to_owned(); /// ``` #[stable(feature = "rust1", since = "1.0.0")] + #[must_use = "cloning is often expensive and is not expected to have side effects"] fn to_owned(&self) -> Self::Owned; /// Uses borrowed data to replace owned data, usually by cloning. |