From 475e9925a71648b48767c03b342fe327c003c15e Mon Sep 17 00:00:00 2001 From: John Kugelman Date: Sat, 9 Oct 2021 21:27:13 -0400 Subject: [PATCH] Add #[must_use] to is_condition tests There's nothing insightful to say about these so I didn't write any extra explanations. --- library/alloc/src/collections/btree/set.rs | 3 +++ library/core/src/char/methods.rs | 19 +++++++++++++++++++ library/core/src/num/f32.rs | 7 +++++++ library/core/src/num/f64.rs | 9 +++++++++ library/core/src/num/int_macros.rs | 2 ++ library/core/src/num/mod.rs | 11 +++++++++++ library/core/src/num/nonzero.rs | 1 + library/core/src/num/saturating.rs | 3 +++ library/core/src/num/uint_macros.rs | 1 + library/core/src/num/wrapping.rs | 3 +++ library/core/src/str/mod.rs | 1 + library/core/src/time.rs | 1 + 12 files changed, 61 insertions(+) diff --git a/library/alloc/src/collections/btree/set.rs b/library/alloc/src/collections/btree/set.rs index 16150ceeb62..f4c10100982 100644 --- a/library/alloc/src/collections/btree/set.rs +++ b/library/alloc/src/collections/btree/set.rs @@ -534,6 +534,7 @@ impl BTreeSet { /// b.insert(1); /// assert_eq!(a.is_disjoint(&b), false); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] pub fn is_disjoint(&self, other: &BTreeSet) -> bool where @@ -559,6 +560,7 @@ impl BTreeSet { /// set.insert(4); /// assert_eq!(set.is_subset(&sup), false); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] pub fn is_subset(&self, other: &BTreeSet) -> bool where @@ -638,6 +640,7 @@ impl BTreeSet { /// set.insert(2); /// assert_eq!(set.is_superset(&sub), true); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] pub fn is_superset(&self, other: &BTreeSet) -> bool where diff --git a/library/core/src/char/methods.rs b/library/core/src/char/methods.rs index b3af1f1ffb5..e5c4719b6f7 100644 --- a/library/core/src/char/methods.rs +++ b/library/core/src/char/methods.rs @@ -692,6 +692,7 @@ impl char { /// // love is many things, but it is not alphabetic /// assert!(!c.is_alphabetic()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[inline] pub fn is_alphabetic(self) -> bool { @@ -724,6 +725,7 @@ impl char { /// assert!(!'中'.is_lowercase()); /// assert!(!' '.is_lowercase()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[inline] pub fn is_lowercase(self) -> bool { @@ -756,6 +758,7 @@ impl char { /// assert!(!'中'.is_uppercase()); /// assert!(!' '.is_uppercase()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[inline] pub fn is_uppercase(self) -> bool { @@ -784,6 +787,7 @@ impl char { /// /// assert!(!'越'.is_whitespace()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[inline] pub fn is_whitespace(self) -> bool { @@ -812,6 +816,7 @@ impl char { /// assert!('و'.is_alphanumeric()); /// assert!('藏'.is_alphanumeric()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[inline] pub fn is_alphanumeric(self) -> bool { @@ -837,6 +842,7 @@ impl char { /// assert!('œ'.is_control()); /// assert!(!'q'.is_control()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[inline] pub fn is_control(self) -> bool { @@ -852,6 +858,7 @@ impl char { /// [uax29]: https://www.unicode.org/reports/tr29/ /// [ucd]: https://www.unicode.org/reports/tr44/ /// [`DerivedCoreProperties.txt`]: https://www.unicode.org/Public/UCD/latest/ucd/DerivedCoreProperties.txt + #[must_use] #[inline] pub(crate) fn is_grapheme_extended(self) -> bool { unicode::Grapheme_Extend(self) @@ -881,6 +888,7 @@ impl char { /// assert!(!'و'.is_numeric()); /// assert!(!'藏'.is_numeric()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[inline] pub fn is_numeric(self) -> bool { @@ -1060,6 +1068,7 @@ impl char { /// assert!(ascii.is_ascii()); /// assert!(!non_ascii.is_ascii()); /// ``` + #[must_use] #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")] #[rustc_const_stable(feature = "const_ascii_methods_on_intrinsics", since = "1.32.0")] #[inline] @@ -1237,6 +1246,7 @@ impl char { /// assert!(!lf.is_ascii_alphabetic()); /// assert!(!esc.is_ascii_alphabetic()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -1270,6 +1280,7 @@ impl char { /// assert!(!lf.is_ascii_uppercase()); /// assert!(!esc.is_ascii_uppercase()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -1303,6 +1314,7 @@ impl char { /// assert!(!lf.is_ascii_lowercase()); /// assert!(!esc.is_ascii_lowercase()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -1339,6 +1351,7 @@ impl char { /// assert!(!lf.is_ascii_alphanumeric()); /// assert!(!esc.is_ascii_alphanumeric()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -1372,6 +1385,7 @@ impl char { /// assert!(!lf.is_ascii_digit()); /// assert!(!esc.is_ascii_digit()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -1408,6 +1422,7 @@ impl char { /// assert!(!lf.is_ascii_hexdigit()); /// assert!(!esc.is_ascii_hexdigit()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -1445,6 +1460,7 @@ impl char { /// assert!(!lf.is_ascii_punctuation()); /// assert!(!esc.is_ascii_punctuation()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -1478,6 +1494,7 @@ impl char { /// assert!(!lf.is_ascii_graphic()); /// assert!(!esc.is_ascii_graphic()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -1528,6 +1545,7 @@ impl char { /// assert!(lf.is_ascii_whitespace()); /// assert!(!esc.is_ascii_whitespace()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -1563,6 +1581,7 @@ impl char { /// assert!(lf.is_ascii_control()); /// assert!(esc.is_ascii_control()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] diff --git a/library/core/src/num/f32.rs b/library/core/src/num/f32.rs index c47a2e8b05c..d3dd710f7c0 100644 --- a/library/core/src/num/f32.rs +++ b/library/core/src/num/f32.rs @@ -436,6 +436,7 @@ impl f32 { /// assert!(nan.is_nan()); /// assert!(!f.is_nan()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -467,6 +468,7 @@ impl f32 { /// assert!(inf.is_infinite()); /// assert!(neg_inf.is_infinite()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -488,6 +490,7 @@ impl f32 { /// assert!(!inf.is_finite()); /// assert!(!neg_inf.is_finite()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -515,6 +518,7 @@ impl f32 { /// assert!(lower_than_min.is_subnormal()); /// ``` /// [subnormal]: https://en.wikipedia.org/wiki/Denormal_number + #[must_use] #[stable(feature = "is_subnormal", since = "1.53.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -541,6 +545,7 @@ impl f32 { /// assert!(!lower_than_min.is_normal()); /// ``` /// [subnormal]: https://en.wikipedia.org/wiki/Denormal_number + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -587,6 +592,7 @@ impl f32 { /// assert!(f.is_sign_positive()); /// assert!(!g.is_sign_positive()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -604,6 +610,7 @@ impl f32 { /// assert!(!f.is_sign_negative()); /// assert!(g.is_sign_negative()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] diff --git a/library/core/src/num/f64.rs b/library/core/src/num/f64.rs index cfcc08b9add..233c7b7e8de 100644 --- a/library/core/src/num/f64.rs +++ b/library/core/src/num/f64.rs @@ -435,6 +435,7 @@ impl f64 { /// assert!(nan.is_nan()); /// assert!(!f.is_nan()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -466,6 +467,7 @@ impl f64 { /// assert!(inf.is_infinite()); /// assert!(neg_inf.is_infinite()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -487,6 +489,7 @@ impl f64 { /// assert!(!inf.is_finite()); /// assert!(!neg_inf.is_finite()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -514,6 +517,7 @@ impl f64 { /// assert!(lower_than_min.is_subnormal()); /// ``` /// [subnormal]: https://en.wikipedia.org/wiki/Denormal_number + #[must_use] #[stable(feature = "is_subnormal", since = "1.53.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -540,6 +544,7 @@ impl f64 { /// assert!(!lower_than_min.is_normal()); /// ``` /// [subnormal]: https://en.wikipedia.org/wiki/Denormal_number + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -586,6 +591,7 @@ impl f64 { /// assert!(f.is_sign_positive()); /// assert!(!g.is_sign_positive()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -593,6 +599,7 @@ impl f64 { !self.is_sign_negative() } + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_deprecated(since = "1.0.0", reason = "renamed to is_sign_positive")] #[inline] @@ -611,6 +618,7 @@ impl f64 { /// assert!(!f.is_sign_negative()); /// assert!(g.is_sign_negative()); /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_float_classify", issue = "72505")] #[inline] @@ -618,6 +626,7 @@ impl f64 { self.to_bits() & 0x8000_0000_0000_0000 != 0 } + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_deprecated(since = "1.0.0", reason = "renamed to is_sign_negative")] #[inline] diff --git a/library/core/src/num/int_macros.rs b/library/core/src/num/int_macros.rs index 12dda61400f..d8825420fba 100644 --- a/library/core/src/num/int_macros.rs +++ b/library/core/src/num/int_macros.rs @@ -2502,6 +2502,7 @@ macro_rules! int_impl { #[doc = concat!("assert!(10", stringify!($SelfT), ".is_positive());")] #[doc = concat!("assert!(!(-10", stringify!($SelfT), ").is_positive());")] /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_stable(feature = "const_int_methods", since = "1.32.0")] #[inline(always)] @@ -2518,6 +2519,7 @@ macro_rules! int_impl { #[doc = concat!("assert!((-10", stringify!($SelfT), ").is_negative());")] #[doc = concat!("assert!(!10", stringify!($SelfT), ".is_negative());")] /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_stable(feature = "const_int_methods", since = "1.32.0")] #[inline(always)] diff --git a/library/core/src/num/mod.rs b/library/core/src/num/mod.rs index 44918a711d4..18ebf1cbb10 100644 --- a/library/core/src/num/mod.rs +++ b/library/core/src/num/mod.rs @@ -259,6 +259,7 @@ impl u8 { /// assert!(ascii.is_ascii()); /// assert!(!non_ascii.is_ascii()); /// ``` + #[must_use] #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")] #[rustc_const_stable(feature = "const_ascii_methods_on_intrinsics", since = "1.43.0")] #[inline] @@ -419,6 +420,7 @@ impl u8 { /// assert!(!lf.is_ascii_alphabetic()); /// assert!(!esc.is_ascii_alphabetic()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -452,6 +454,7 @@ impl u8 { /// assert!(!lf.is_ascii_uppercase()); /// assert!(!esc.is_ascii_uppercase()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -485,6 +488,7 @@ impl u8 { /// assert!(!lf.is_ascii_lowercase()); /// assert!(!esc.is_ascii_lowercase()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -521,6 +525,7 @@ impl u8 { /// assert!(!lf.is_ascii_alphanumeric()); /// assert!(!esc.is_ascii_alphanumeric()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -554,6 +559,7 @@ impl u8 { /// assert!(!lf.is_ascii_digit()); /// assert!(!esc.is_ascii_digit()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -590,6 +596,7 @@ impl u8 { /// assert!(!lf.is_ascii_hexdigit()); /// assert!(!esc.is_ascii_hexdigit()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -627,6 +634,7 @@ impl u8 { /// assert!(!lf.is_ascii_punctuation()); /// assert!(!esc.is_ascii_punctuation()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -660,6 +668,7 @@ impl u8 { /// assert!(!lf.is_ascii_graphic()); /// assert!(!esc.is_ascii_graphic()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -710,6 +719,7 @@ impl u8 { /// assert!(lf.is_ascii_whitespace()); /// assert!(!esc.is_ascii_whitespace()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] @@ -745,6 +755,7 @@ impl u8 { /// assert!(lf.is_ascii_control()); /// assert!(esc.is_ascii_control()); /// ``` + #[must_use] #[stable(feature = "ascii_ctype_on_intrinsics", since = "1.24.0")] #[rustc_const_stable(feature = "const_ascii_ctype_on_intrinsics", since = "1.47.0")] #[inline] diff --git a/library/core/src/num/nonzero.rs b/library/core/src/num/nonzero.rs index e44597279ba..c1e768655e0 100644 --- a/library/core/src/num/nonzero.rs +++ b/library/core/src/num/nonzero.rs @@ -878,6 +878,7 @@ macro_rules! nonzero_unsigned_is_power_of_two { #[doc = concat!("let ten = std::num::", stringify!($Ty), "::new(10).unwrap();")] /// assert!(!ten.is_power_of_two()); /// ``` + #[must_use] #[unstable(feature = "nonzero_is_power_of_two", issue = "81106")] #[inline] pub const fn is_power_of_two(self) -> bool { diff --git a/library/core/src/num/saturating.rs b/library/core/src/num/saturating.rs index f6dd3603c49..af7b9c63fd2 100644 --- a/library/core/src/num/saturating.rs +++ b/library/core/src/num/saturating.rs @@ -847,6 +847,7 @@ macro_rules! saturating_int_impl_signed { #[doc = concat!("assert!(Saturating(10", stringify!($t), ").is_positive());")] #[doc = concat!("assert!(!Saturating(-10", stringify!($t), ").is_positive());")] /// ``` + #[must_use] #[inline] #[unstable(feature = "saturating_int_impl", issue = "87920")] pub const fn is_positive(self) -> bool { @@ -867,6 +868,7 @@ macro_rules! saturating_int_impl_signed { #[doc = concat!("assert!(Saturating(-10", stringify!($t), ").is_negative());")] #[doc = concat!("assert!(!Saturating(10", stringify!($t), ").is_negative());")] /// ``` + #[must_use] #[inline] #[unstable(feature = "saturating_int_impl", issue = "87920")] pub const fn is_negative(self) -> bool { @@ -925,6 +927,7 @@ macro_rules! saturating_int_impl_unsigned { #[doc = concat!("assert!(Saturating(16", stringify!($t), ").is_power_of_two());")] #[doc = concat!("assert!(!Saturating(10", stringify!($t), ").is_power_of_two());")] /// ``` + #[must_use] #[inline] #[unstable(feature = "saturating_int_impl", issue = "87920")] pub fn is_power_of_two(self) -> bool { diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs index 25cd582bb67..c5b79ab3c7d 100644 --- a/library/core/src/num/uint_macros.rs +++ b/library/core/src/num/uint_macros.rs @@ -2087,6 +2087,7 @@ macro_rules! uint_impl { #[doc = concat!("assert!(16", stringify!($SelfT), ".is_power_of_two());")] #[doc = concat!("assert!(!10", stringify!($SelfT), ".is_power_of_two());")] /// ``` + #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_stable(feature = "const_is_power_of_two", since = "1.32.0")] #[inline(always)] diff --git a/library/core/src/num/wrapping.rs b/library/core/src/num/wrapping.rs index b078cdf5479..beb413bbddc 100644 --- a/library/core/src/num/wrapping.rs +++ b/library/core/src/num/wrapping.rs @@ -844,6 +844,7 @@ macro_rules! wrapping_int_impl_signed { #[doc = concat!("assert!(Wrapping(10", stringify!($t), ").is_positive());")] #[doc = concat!("assert!(!Wrapping(-10", stringify!($t), ").is_positive());")] /// ``` + #[must_use] #[inline] #[unstable(feature = "wrapping_int_impl", issue = "32463")] pub const fn is_positive(self) -> bool { @@ -864,6 +865,7 @@ macro_rules! wrapping_int_impl_signed { #[doc = concat!("assert!(Wrapping(-10", stringify!($t), ").is_negative());")] #[doc = concat!("assert!(!Wrapping(10", stringify!($t), ").is_negative());")] /// ``` + #[must_use] #[inline] #[unstable(feature = "wrapping_int_impl", issue = "32463")] pub const fn is_negative(self) -> bool { @@ -911,6 +913,7 @@ macro_rules! wrapping_int_impl_unsigned { #[doc = concat!("assert!(Wrapping(16", stringify!($t), ").is_power_of_two());")] #[doc = concat!("assert!(!Wrapping(10", stringify!($t), ").is_power_of_two());")] /// ``` + #[must_use] #[inline] #[unstable(feature = "wrapping_int_impl", issue = "32463")] pub fn is_power_of_two(self) -> bool { diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs index f25ab52cfa0..b5d151e479f 100644 --- a/library/core/src/str/mod.rs +++ b/library/core/src/str/mod.rs @@ -188,6 +188,7 @@ impl str { /// // third byte of `老` /// assert!(!s.is_char_boundary(8)); /// ``` + #[must_use] #[stable(feature = "is_char_boundary", since = "1.9.0")] #[inline] pub fn is_char_boundary(&self, index: usize) -> bool { diff --git a/library/core/src/time.rs b/library/core/src/time.rs index d1533b8d67a..949a3e68f2b 100644 --- a/library/core/src/time.rs +++ b/library/core/src/time.rs @@ -291,6 +291,7 @@ impl Duration { /// assert!(!Duration::from_nanos(1).is_zero()); /// assert!(!Duration::from_secs(1).is_zero()); /// ``` + #[must_use] #[stable(feature = "duration_zero", since = "1.53.0")] #[rustc_const_stable(feature = "duration_zero", since = "1.53.0")] #[inline]