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-rw-r--r--library/alloc/src/collections/btree/set.rs3
-rw-r--r--library/core/src/char/methods.rs19
-rw-r--r--library/core/src/num/f32.rs7
-rw-r--r--library/core/src/num/f64.rs9
-rw-r--r--library/core/src/num/int_macros.rs2
-rw-r--r--library/core/src/num/mod.rs11
-rw-r--r--library/core/src/num/nonzero.rs1
-rw-r--r--library/core/src/num/saturating.rs3
-rw-r--r--library/core/src/num/uint_macros.rs1
-rw-r--r--library/core/src/num/wrapping.rs3
-rw-r--r--library/core/src/str/mod.rs1
-rw-r--r--library/core/src/time.rs1
12 files changed, 61 insertions, 0 deletions
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<T> BTreeSet<T> {
     /// 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<T>) -> bool
     where
@@ -559,6 +560,7 @@ impl<T> BTreeSet<T> {
     /// 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<T>) -> bool
     where
@@ -638,6 +640,7 @@ impl<T> BTreeSet<T> {
     /// 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<T>) -> 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 7e8a55d12dd..1eff6f96130 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!($t), ").is_power_of_two());")]
             /// ```
+            #[must_use]
             #[inline]
             #[unstable(feature = "saturating_int_impl", issue = "87920")]
             pub fn is_power_of_two(self) -> bool {
diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs
index bed9d4b23ef..8cd5b2c6dc0 100644
--- a/library/core/src/num/uint_macros.rs
+++ b/library/core/src/num/uint_macros.rs
@@ -2086,6 +2086,7 @@ macro_rules! uint_impl {
         #[doc = concat!("assert!(16", stringify!($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 a50b65ec6af..14ce94c178c 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]
generated by cgit-pink 1.4.1-3-g733a5 (git 2.37.1) at 2026-05-04 18:09:59 +0000