Mark Option::insert as must_use

2021-07-17 00:19:44 +08:00 · 2021-07-17 00:19:44 +08:00 · 774a79e3fd
commit 774a79e3fd
parent a6470c7fa8
1 changed files with 1 additions and 0 deletions
--- a/library/core/src/option.rs
+++ b/library/core/src/option.rs
@ -1179,6 +1179,7 @@ impl<T> Option<T> {
    /// *val = 3;
    /// assert_eq!(opt.unwrap(), 3);
    /// ```
+    #[must_use = "if you intended to set a value, consider assignment instead"]
    #[inline]
    #[stable(feature = "option_insert", since = "1.53.0")]
    pub fn insert(&mut self, value: T) -> &mut T {