diff options
| -rw-r--r-- | src/libcore/str/mod.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs index ac920185636..80f324b8057 100644 --- a/src/libcore/str/mod.rs +++ b/src/libcore/str/mod.rs @@ -3489,6 +3489,8 @@ impl str { /// /// assert_eq!("Hello\tworld", s.trim()); /// ``` + #[must_use = "this returns the trimmed string as a slice, \ + without modifying the original"] #[stable(feature = "rust1", since = "1.0.0")] pub fn trim(&self) -> &str { self.trim_matches(|c: char| c.is_whitespace()) @@ -3524,6 +3526,8 @@ impl str { /// let s = " עברית "; /// assert!(Some('ע') == s.trim_start().chars().next()); /// ``` + #[must_use = "this returns the trimmed string as a new slice, \ + without modifying the original"] #[stable(feature = "trim_direction", since = "1.30.0")] pub fn trim_start(&self) -> &str { self.trim_start_matches(|c: char| c.is_whitespace()) @@ -3559,6 +3563,8 @@ impl str { /// let s = " עברית "; /// assert!(Some('ת') == s.trim_end().chars().rev().next()); /// ``` + #[must_use = "this returns the trimmed string as a new slice, \ + without modifying the original"] #[stable(feature = "trim_direction", since = "1.30.0")] pub fn trim_end(&self) -> &str { self.trim_end_matches(|c: char| c.is_whitespace()) @@ -3661,6 +3667,8 @@ impl str { /// ``` /// assert_eq!("1foo1barXX".trim_matches(|c| c == '1' || c == 'X'), "foo1bar"); /// ``` + #[must_use = "this returns the trimmed string as a new slice, \ + without modifying the original"] #[stable(feature = "rust1", since = "1.0.0")] pub fn trim_matches<'a, P: Pattern<'a>>(&'a self, pat: P) -> &'a str where P::Searcher: DoubleEndedSearcher<'a> @@ -3706,6 +3714,8 @@ impl str { /// let x: &[_] = &['1', '2']; /// assert_eq!("12foo1bar12".trim_start_matches(x), "foo1bar12"); /// ``` + #[must_use = "this returns the trimmed string as a new slice, \ + without modifying the original"] #[stable(feature = "trim_direction", since = "1.30.0")] pub fn trim_start_matches<'a, P: Pattern<'a>>(&'a self, pat: P) -> &'a str { let mut i = self.len(); @@ -3749,6 +3759,8 @@ impl str { /// ``` /// assert_eq!("1fooX".trim_end_matches(|c| c == '1' || c == 'X'), "1foo"); /// ``` + #[must_use = "this returns the trimmed string as a new slice, \ + without modifying the original"] #[stable(feature = "trim_direction", since = "1.30.0")] pub fn trim_end_matches<'a, P: Pattern<'a>>(&'a self, pat: P) -> &'a str where P::Searcher: ReverseSearcher<'a> |