Tracking issue for adding #[must_use] annotations throughout the standard library #89692

jkugelman · 2021-10-09T03:51:15Z

This is a tracking issue for a large scale effort to comb the standard library and add missing #[must_use] annotations. Due to the number of edits being made—over 800—I'm doing it in many small PRs.

For an overview of what's being done and why see the libs-team MCP.

Pull requests

Done

List of all functions touched across all the PRs (long!)

Add #[must_use] to stdin/stdout/stderr locks #89693

std/src/io/stdio.rs:351:1    std::io           fn stdin_locked() -> StdinLock<'static>;
std/src/io/stdio.rs:378:5    std::io::Stdin    fn lock(&self) -> StdinLock<'_>;
std/src/io/stdio.rs:446:5    std::io::Stdin    fn into_locked(self) -> StdinLock<'static>;
std/src/io/stdio.rs:715:1    std::io           fn stdout_locked() -> StdoutLock<'static>;
std/src/io/stdio.rs:755:5    std::io::Stdout   fn lock(&self) -> StdoutLock<'_>;
std/src/io/stdio.rs:792:5    std::io::Stdout   fn into_locked(self) -> StdoutLock<'static>;
std/src/io/stdio.rs:992:1    std::io           fn stderr_locked() -> StderrLock<'static>;
std/src/io/stdio.rs:1018:5   std::io::Stderr   fn lock(&self) -> StderrLock<'_>;
std/src/io/stdio.rs:1052:5   std::io::Stderr   fn into_locked(self) -> StderrLock<'static>;

Add #[must_use] to string transformation methods #89694

alloc/src/slice.rs:667:5          [u8]              fn to_ascii_uppercase(&self) -> Vec<u8>;
alloc/src/slice.rs:685:5          [u8]              fn to_ascii_lowercase(&self) -> Vec<u8>;
alloc/src/str.rs:371:5            str               fn to_lowercase(&self) -> String;
alloc/src/str.rs:451:5            str               fn to_uppercase(&self) -> String;
alloc/src/str.rs:539:5            str               fn to_ascii_uppercase(&self) -> String;
alloc/src/str.rs:570:5            str               fn to_ascii_lowercase(&self) -> String;
core/src/char/methods.rs:954:5    char              fn to_lowercase(self) -> ToLowercase;
core/src/char/methods.rs:1044:5   char              fn to_uppercase(self) -> ToUppercase;
core/src/char/methods.rs:1091:5   char              const fn to_ascii_uppercase(&self) -> char;
core/src/char/methods.rs:1124:5   char              const fn to_ascii_lowercase(&self) -> char;
core/src/num/mod.rs:288:5         u8                const fn to_ascii_uppercase(&self) -> u8;
core/src/num/mod.rs:312:5         u8                const fn to_ascii_lowercase(&self) -> u8;
core/src/num/mod.rs:774:5         u8                fn escape_ascii(&self) -> ascii::EscapeDefault;
core/src/slice/ascii.rs:76:5      slice             fn escape_ascii(&self) -> EscapeAscii<'_>;
core/src/str/mod.rs:803:5         str               fn split_whitespace(&self) -> SplitWhitespace<'_>;
core/src/str/mod.rs:844:5         str               fn split_ascii_whitespace(&self) -> SplitAsciiWhitespace<'_>;
core/src/str/mod.rs:918:5         str               fn encode_utf16(&self) -> EncodeUtf16<'_>;
core/src/str/mod.rs:1850:5        str               fn trim_left(&self) -> &str;
core/src/str/mod.rs:1892:5        str               fn trim_right(&self) -> &str;
core/src/str/mod.rs:2350:5        str               fn escape_debug(&self) -> EscapeDebug<'_>;
core/src/str/mod.rs:2394:5        str               fn escape_default(&self) -> EscapeDefault<'_>;
core/src/str/mod.rs:2430:5        str               fn escape_unicode(&self) -> EscapeUnicode<'_>;
std/src/ffi/os_str.rs:781:5       std::ffi::OsStr   fn to_ascii_lowercase(&self) -> OsString;
std/src/ffi/os_str.rs:802:5       std::ffi::OsStr   fn to_ascii_uppercase(&self) -> OsString;

Add #[must_use] to is_condition checks #89718

alloc/src/collections/btree/set.rs:538:5   alloc::collections::btree_set::BTreeSet<T>   fn is_disjoint(&self, other: &BTreeSet<T>) -> bool;
alloc/src/collections/btree/set.rs:563:5   alloc::collections::btree_set::BTreeSet<T>   fn is_subset(&self, other: &BTreeSet<T>) -> bool;
alloc/src/collections/btree/set.rs:642:5   alloc::collections::btree_set::BTreeSet<T>   fn is_superset(&self, other: &BTreeSet<T>) -> bool;
core/src/char/methods.rs:283:5             char                                         fn is_digit(self, radix: u32) -> bool;
core/src/char/methods.rs:697:5             char                                         fn is_alphabetic(self) -> bool;
core/src/char/methods.rs:729:5             char                                         fn is_lowercase(self) -> bool;
core/src/char/methods.rs:761:5             char                                         fn is_uppercase(self) -> bool;
core/src/char/methods.rs:789:5             char                                         fn is_whitespace(self) -> bool;
core/src/char/methods.rs:817:5             char                                         fn is_alphanumeric(self) -> bool;
core/src/char/methods.rs:842:5             char                                         fn is_control(self) -> bool;
core/src/char/methods.rs:886:5             char                                         fn is_numeric(self) -> bool;
core/src/char/methods.rs:1062:5            char                                         const fn is_ascii(&self) -> bool;
core/src/char/methods.rs:1237:5            char                                         const fn is_ascii_alphabetic(&self) -> bool;
core/src/char/methods.rs:1270:5            char                                         const fn is_ascii_uppercase(&self) -> bool;
core/src/char/methods.rs:1303:5            char                                         const fn is_ascii_lowercase(&self) -> bool;
core/src/char/methods.rs:1339:5            char                                         const fn is_ascii_alphanumeric(&self) -> bool;
core/src/char/methods.rs:1372:5            char                                         const fn is_ascii_digit(&self) -> bool;
core/src/char/methods.rs:1408:5            char                                         const fn is_ascii_hexdigit(&self) -> bool;
core/src/char/methods.rs:1445:5            char                                         const fn is_ascii_punctuation(&self) -> bool;
core/src/char/methods.rs:1478:5            char                                         const fn is_ascii_graphic(&self) -> bool;
core/src/char/methods.rs:1528:5            char                                         const fn is_ascii_whitespace(&self) -> bool;
core/src/char/methods.rs:1563:5            char                                         const fn is_ascii_control(&self) -> bool;
core/src/num/f32.rs:442:5                  core::num::f32                               const fn is_nan(self) -> bool;
core/src/num/f32.rs:473:5                  core::num::f32                               const fn is_infinite(self) -> bool;
core/src/num/f32.rs:494:5                  core::num::f32                               const fn is_finite(self) -> bool;
core/src/num/f32.rs:521:5                  core::num::f32                               const fn is_subnormal(self) -> bool;
core/src/num/f32.rs:547:5                  core::num::f32                               const fn is_normal(self) -> bool;
core/src/num/f32.rs:593:5                  core::num::f32                               const fn is_sign_positive(self) -> bool;
core/src/num/f32.rs:610:5                  core::num::f32                               const fn is_sign_negative(self) -> bool;
core/src/num/f64.rs:441:5                  core::num::f64                               const fn is_nan(self) -> bool;
core/src/num/f64.rs:472:5                  core::num::f64                               const fn is_infinite(self) -> bool;
core/src/num/f64.rs:493:5                  core::num::f64                               const fn is_finite(self) -> bool;
core/src/num/f64.rs:520:5                  core::num::f64                               const fn is_subnormal(self) -> bool;
core/src/num/f64.rs:546:5                  core::num::f64                               const fn is_normal(self) -> bool;
core/src/num/f64.rs:592:5                  core::num::f64                               const fn is_sign_positive(self) -> bool;
core/src/num/f64.rs:600:5                  core::num::f64                               fn is_positive(self) -> bool;
core/src/num/f64.rs:617:5                  core::num::f64                               const fn is_sign_negative(self) -> bool;
core/src/num/f64.rs:625:5                  core::num::f64                               fn is_negative(self) -> bool;
core/src/num/int_macros.rs:2318:9          $Int                                         const fn is_positive(self) -> bool;
core/src/num/int_macros.rs:2334:9          $Int                                         const fn is_negative(self) -> bool;
core/src/num/mod.rs:265:5                  u8                                           const fn is_ascii(&self) -> bool;
core/src/num/mod.rs:423:5                  u8                                           const fn is_ascii_alphabetic(&self) -> bool;
core/src/num/mod.rs:456:5                  u8                                           const fn is_ascii_uppercase(&self) -> bool;
core/src/num/mod.rs:489:5                  u8                                           const fn is_ascii_lowercase(&self) -> bool;
core/src/num/mod.rs:525:5                  u8                                           const fn is_ascii_alphanumeric(&self) -> bool;
core/src/num/mod.rs:558:5                  u8                                           const fn is_ascii_digit(&self) -> bool;
core/src/num/mod.rs:594:5                  u8                                           const fn is_ascii_hexdigit(&self) -> bool;
core/src/num/mod.rs:631:5                  u8                                           const fn is_ascii_punctuation(&self) -> bool;
core/src/num/mod.rs:664:5                  u8                                           const fn is_ascii_graphic(&self) -> bool;
core/src/num/mod.rs:714:5                  u8                                           const fn is_ascii_whitespace(&self) -> bool;
core/src/num/mod.rs:749:5                  u8                                           const fn is_ascii_control(&self) -> bool;
core/src/num/nonzero.rs:883:17             core::num::NonZero$Int                       const fn is_power_of_two(self) -> bool;
core/src/num/saturating.rs:852:13          core::num::Saturating<$Int>                  const fn is_positive(self) -> bool;
core/src/num/saturating.rs:872:13          core::num::Saturating<$Int>                  const fn is_negative(self) -> bool;
core/src/num/saturating.rs:930:13          core::num::Saturating<$Int>                  fn is_power_of_two(self) -> bool;
core/src/num/uint_macros.rs:1993:9         $Int                                         const fn is_power_of_two(self) -> bool;
core/src/num/wrapping.rs:849:13            core::num::Wrapping<$Int>                    const fn is_positive(self) -> bool;
core/src/num/wrapping.rs:869:13            core::num::Wrapping<$Int>                    const fn is_negative(self) -> bool;
core/src/num/wrapping.rs:916:13            core::num::Wrapping<$Int>                    fn is_power_of_two(self) -> bool;
core/src/str/mod.rs:193:5                  str                                          fn is_char_boundary(&self, index: usize) -> bool;
core/src/time.rs:297:5                     core::time::Duration                         const fn is_zero(&self) -> bool;

Add #[must_use] to char escape methods #89719

core/src/char/methods.rs:382:5   char   fn escape_unicode(self) -> EscapeUnicode;
core/src/char/methods.rs:458:5   char   fn escape_debug(self) -> EscapeDebug;
core/src/char/methods.rs:512:5   char   fn escape_default(self) -> EscapeDefault;

Add #[must_use] to math and bit manipulation methods #89720

core/src/num/f32.rs:641:5            core::num::f32                fn to_degrees(self) -> f32;
core/src/num/f32.rs:658:5            core::num::f32                fn to_radians(self) -> f32;
core/src/num/f32.rs:717:5            core::num::f32                unsafe fn to_int_unchecked<Int>(self) -> Int;
core/src/num/f32.rs:746:5            core::num::f32                const fn to_bits(self) -> u32;
core/src/num/f32.rs:808:5            core::num::f32                const fn to_be_bytes(self) -> [u8; 4];
core/src/num/f32.rs:824:5            core::num::f32                const fn to_le_bytes(self) -> [u8; 4];
core/src/num/f32.rs:853:5            core::num::f32                const fn to_ne_bytes(self) -> [u8; 4];
core/src/num/f64.rs:654:5            core::num::f64                fn to_degrees(self) -> f64;
core/src/num/f64.rs:672:5            core::num::f64                fn to_radians(self) -> f64;
core/src/num/f64.rs:731:5            core::num::f64                unsafe fn to_int_unchecked<Int>(self) -> Int;
core/src/num/f64.rs:760:5            core::num::f64                const fn to_bits(self) -> u64;
core/src/num/f64.rs:822:5            core::num::f64                const fn to_be_bytes(self) -> [u8; 8];
core/src/num/f64.rs:838:5            core::num::f64                const fn to_le_bytes(self) -> [u8; 8];
core/src/num/f64.rs:867:5            core::num::f64                const fn to_ne_bytes(self) -> [u8; 8];
core/src/num/int_macros.rs:85:9      $Int                          const fn count_ones(self) -> u32;
core/src/num/int_macros.rs:85:9      $Int                          const fn count_ones(self) -> u32;
core/src/num/int_macros.rs:99:9      $Int                          const fn count_zeros(self) -> u32;
core/src/num/int_macros.rs:99:9      $Int                          const fn count_zeros(self) -> u32;
core/src/num/int_macros.rs:117:9     $Int                          const fn leading_zeros(self) -> u32;
core/src/num/int_macros.rs:135:9     $Int                          const fn trailing_zeros(self) -> u32;
core/src/num/int_macros.rs:153:9     $Int                          const fn leading_ones(self) -> u32;
core/src/num/int_macros.rs:171:9     $Int                          const fn trailing_ones(self) -> u32;
core/src/num/int_macros.rs:240:9     $Int                          const fn swap_bytes(self) -> Self;
core/src/num/int_macros.rs:348:9     $Int                          const fn to_be(self) -> Self;
core/src/num/int_macros.rs:379:9     $Int                          const fn to_le(self) -> Self;
core/src/num/int_macros.rs:649:9     $Int                          const fn checked_neg(self) -> Option<Self>;
core/src/num/int_macros.rs:761:9     $Int                          const fn checked_abs(self) -> Option<Self>;
core/src/num/int_macros.rs:867:9     $Int                          const fn saturating_neg(self) -> Self;
core/src/num/int_macros.rs:888:9     $Int                          const fn saturating_abs(self) -> Self;
core/src/num/int_macros.rs:1174:9    $Int                          const fn wrapping_neg(self) -> Self;
core/src/num/int_macros.rs:1257:9    $Int                          const fn wrapping_abs(self) -> Self;
core/src/num/int_macros.rs:1271:9    $Int                          const fn unsigned_abs(self) -> $UnsignedT;
core/src/num/int_macros.rs:1595:9    $Int                          const fn overflowing_neg(self) -> (Self, bool);
core/src/num/int_macros.rs:1669:9    $Int                          const fn overflowing_abs(self) -> (Self, bool);
core/src/num/int_macros.rs:2227:9    $Int                          const fn abs(self) -> Self;
core/src/num/int_macros.rs:2257:9    $Int                          const fn abs_diff(self) -> $UnsignedT;
core/src/num/int_macros.rs:2296:9    $Int                          const fn signum(self) -> Self;
core/src/num/int_macros.rs:2350:9    $Int                          const fn to_be_bytes(self) -> [u8; mem::size_of::<Self>()];
core/src/num/int_macros.rs:2368:9    $Int                          const fn to_le_bytes(self) -> [u8; mem::size_of::<Self>()];
core/src/num/int_macros.rs:2402:9    $Int                          const fn to_ne_bytes(self) -> [u8; mem::size_of::<Self>()];
core/src/num/nonzero.rs:202:17       core::num::NonZero$Int        const fn leading_zeros(self) -> u32;
core/src/num/nonzero.rs:224:17       core::num::NonZero$Int        const fn trailing_zeros(self) -> u32;
core/src/num/nonzero.rs:319:17       core::num::NonZero$Int        const fn checked_add(self, other: $Int) -> Option<$Ty>;
core/src/num/nonzero.rs:352:17       core::num::NonZero$Int        const fn saturating_add(self, other: $Int) -> $Ty;
core/src/num/nonzero.rs:382:17       core::num::NonZero$Int        const unsafe fn unchecked_add(self, other: $Int) -> $Ty;
core/src/num/nonzero.rs:414:17       core::num::NonZero$Int        const fn checked_next_power_of_two(self) -> Option<$Ty>;
core/src/num/nonzero.rs:464:17       core::num::NonZero$Int        const fn abs(self) -> $Ty;
core/src/num/nonzero.rs:494:17       core::num::NonZero$Int        const fn checked_abs(self) -> Option<$Ty>;
core/src/num/nonzero.rs:528:17       core::num::NonZero$Int        const fn overflowing_abs(self) -> ($Ty, bool);
core/src/num/nonzero.rs:566:17       core::num::NonZero$Int        const fn saturating_abs(self) -> $Ty;
core/src/num/nonzero.rs:599:17       core::num::NonZero$Int        const fn wrapping_abs(self) -> $Ty;
core/src/num/nonzero.rs:632:17       core::num::NonZero$Int        const fn unsigned_abs(self) -> $Uty;
core/src/num/nonzero.rs:679:17       core::num::NonZero$Int        const fn checked_mul(self, other: $Ty) -> Option<$Ty>;
core/src/num/nonzero.rs:713:17       core::num::NonZero$Int        const fn saturating_mul(self, other: $Ty) -> $Ty;
core/src/num/nonzero.rs:753:17       core::num::NonZero$Int        const unsafe fn unchecked_mul(self, other: $Ty) -> $Ty;
core/src/num/nonzero.rs:782:17       core::num::NonZero$Int        const fn checked_pow(self, other: u32) -> Option<$Ty>;
core/src/num/nonzero.rs:824:17       core::num::NonZero$Int        const fn saturating_pow(self, other: u32) -> $Ty;
core/src/num/saturating.rs:478:13    core::num::Saturating<$Int>   const fn count_ones(self) -> u32;
core/src/num/saturating.rs:496:13    core::num::Saturating<$Int>   const fn count_zeros(self) -> u32;
core/src/num/saturating.rs:516:13    core::num::Saturating<$Int>   const fn trailing_zeros(self) -> u32;
core/src/num/saturating.rs:542:13    core::num::Saturating<$Int>   const fn rotate_left(self, n: u32) -> Self;
core/src/num/saturating.rs:568:13    core::num::Saturating<$Int>   const fn rotate_right(self, n: u32) -> Self;
core/src/num/saturating.rs:592:13    core::num::Saturating<$Int>   const fn swap_bytes(self) -> Self;
core/src/num/saturating.rs:702:13    core::num::Saturating<$Int>   const fn to_be(self) -> Self;
core/src/num/saturating.rs:729:13    core::num::Saturating<$Int>   const fn to_le(self) -> Self;
core/src/num/saturating.rs:757:13    core::num::Saturating<$Int>   fn pow(self, exp: u32) -> Self;
core/src/num/saturating.rs:785:13    core::num::Saturating<$Int>   const fn leading_zeros(self) -> u32;
core/src/num/saturating.rs:808:13    core::num::Saturating<$Int>   fn abs(self) -> Saturating<$t>;
core/src/num/saturating.rs:832:13    core::num::Saturating<$Int>   fn signum(self) -> Saturating<$t>;
core/src/num/saturating.rs:911:13    core::num::Saturating<$Int>   const fn leading_zeros(self) -> u32;
core/src/num/uint_macros.rs:84:9     $Int                          const fn count_ones(self) -> u32;
core/src/num/uint_macros.rs:100:9    $Int                          const fn count_zeros(self) -> u32;
core/src/num/uint_macros.rs:118:9    $Int                          const fn leading_zeros(self) -> u32;
core/src/num/uint_macros.rs:137:9    $Int                          const fn trailing_zeros(self) -> u32;
core/src/num/uint_macros.rs:155:9    $Int                          const fn leading_ones(self) -> u32;
core/src/num/uint_macros.rs:174:9    $Int                          const fn trailing_ones(self) -> u32;
core/src/num/uint_macros.rs:242:9    $Int                          const fn swap_bytes(self) -> Self;
core/src/num/uint_macros.rs:353:9    $Int                          const fn to_be(self) -> Self;
core/src/num/uint_macros.rs:385:9    $Int                          const fn to_le(self) -> Self;
core/src/num/uint_macros.rs:842:9    $Int                          const fn checked_neg(self) -> Option<Self>;
core/src/num/uint_macros.rs:1277:9   $Int                          const fn wrapping_neg(self) -> Self;
core/src/num/uint_macros.rs:1506:9   $Int                          const fn abs_diff(self, other: Self) -> Self;
core/src/num/uint_macros.rs:1679:9   $Int                          const fn overflowing_neg(self) -> (Self, bool);
core/src/num/uint_macros.rs:1894:9   $Int                          const fn unstable_div_floor(self, rhs: Self) -> Self;
core/src/num/uint_macros.rs:1915:9   $Int                          const fn unstable_div_ceil(self, rhs: Self) -> Self;
core/src/num/uint_macros.rs:2038:9   $Int                          const fn next_power_of_two(self) -> Self;
core/src/num/uint_macros.rs:2058:9   $Int                          const fn checked_next_power_of_two(self) -> Option<Self>;
core/src/num/uint_macros.rs:2080:9   $Int                          const fn wrapping_next_power_of_two(self) -> Self;
core/src/num/uint_macros.rs:2098:9   $Int                          const fn to_be_bytes(self) -> [u8; mem::size_of::<Self>()];
core/src/num/uint_macros.rs:2116:9   $Int                          const fn to_le_bytes(self) -> [u8; mem::size_of::<Self>()];
core/src/num/uint_macros.rs:2150:9   $Int                          const fn to_ne_bytes(self) -> [u8; mem::size_of::<Self>()];
core/src/num/wrapping.rs:473:13      core::num::Wrapping<$Int>     const fn count_ones(self) -> u32;
core/src/num/wrapping.rs:491:13      core::num::Wrapping<$Int>     const fn count_zeros(self) -> u32;
core/src/num/wrapping.rs:511:13      core::num::Wrapping<$Int>     const fn trailing_zeros(self) -> u32;
core/src/num/wrapping.rs:537:13      core::num::Wrapping<$Int>     const fn rotate_left(self, n: u32) -> Self;
core/src/num/wrapping.rs:563:13      core::num::Wrapping<$Int>     const fn rotate_right(self, n: u32) -> Self;
core/src/num/wrapping.rs:587:13      core::num::Wrapping<$Int>     const fn swap_bytes(self) -> Self;
core/src/num/wrapping.rs:696:13      core::num::Wrapping<$Int>     const fn to_be(self) -> Self;
core/src/num/wrapping.rs:723:13      core::num::Wrapping<$Int>     const fn to_le(self) -> Self;
core/src/num/wrapping.rs:750:13      core::num::Wrapping<$Int>     fn pow(self, exp: 32) -> Self;
core/src/num/wrapping.rs:779:13      core::num::Wrapping<$Int>     const fn leading_zeros(self) -> u32;
core/src/num/wrapping.rs:805:13      core::num::Wrapping<$Int>     fn abs(self) -> Wrapping<$t>;
core/src/num/wrapping.rs:829:13      core::num::Wrapping<$Int>     fn signum(self) -> Wrapping<$t>;
core/src/num/wrapping.rs:897:13      core::num::Wrapping<$Int>     const fn leading_zeros(self) -> u32;
core/src/num/wrapping.rs:940:13      core::num::Wrapping<$Int>     fn next_power_of_two(self) -> Self;
core/src/time.rs:469:5               core::time::Duration          const fn checked_add(self, rhs: Duration) -> Option<Duration>;
core/src/time.rs:502:5               core::time::Duration          const fn saturating_add(self, rhs: Duration) -> Duration;
core/src/time.rs:525:5               core::time::Duration          const fn checked_sub(self, rhs: Duration) -> Option<Duration>;
core/src/time.rs:556:5               core::time::Duration          const fn saturating_sub(self, rhs: Duration) -> Duration;
core/src/time.rs:579:5               core::time::Duration          const fn checked_mul(self, rhs: u32) -> Option<Duration>;
core/src/time.rs:608:5               core::time::Duration          const fn saturating_mul(self, rhs: u32) -> Duration;
core/src/time.rs:632:5               core::time::Duration          const fn checked_div(self, rhs: u32) -> Option<Duration>;
core/src/time.rs:819:5               core::time::Duration          const fn mul_f64(self, rhs: f64) -> Duration;
core/src/time.rs:841:5               core::time::Duration          const fn mul_f32(self, rhs: f32) -> Duration;
core/src/time.rs:862:5               core::time::Duration          const fn div_f64(self, rhs: f64) -> Duration;
core/src/time.rs:885:5               core::time::Duration          const fn div_f32(self, rhs: f32) -> Duration;
core/src/time.rs:903:5               core::time::Duration          const fn div_duration_f64(self, rhs: Duration) -> f64;
core/src/time.rs:921:5               core::time::Duration          const fn div_duration_f32(self, rhs: Duration) -> f32;

Add #[must_use] to alloc constructors #89726

alloc/src/boxed.rs:190:5                       alloc::boxed::Box<T>                             fn new() -> Self;
alloc/src/boxed.rs:215:5                       alloc::boxed::Box<T>                             fn new_uninit() -> Box<mem::MaybeUninit<T>>;
alloc/src/boxed.rs:240:5                       alloc::boxed::Box<T>                             fn new_zeroed() -> Box<mem::MaybeUninit<T>>;
alloc/src/boxed.rs:249:5                       alloc::boxed::Box<T>                             fn pin(x: T) -> Pin<Box<T>>;
alloc/src/boxed.rs:343:5                       alloc::boxed::Box<T, A>                          fn new_in(x: T, alloc: A) -> Self;
alloc/src/boxed.rs:405:5                       alloc::boxed::Box<T, A>                          fn new_uninit_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>;
alloc/src/boxed.rs:469:5                       alloc::boxed::Box<T, A>                          fn new_zeroed_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>;
alloc/src/boxed.rs:514:5                       alloc::boxed::Box<T, A>                          fn pin_in(x: T, alloc: A) -> Pin<Self>;
alloc/src/boxed.rs:564:5                       alloc::boxed::Box<[T]>                           fn new_uninit_slice(len: usize) -> Box<[mem::MaybeUninit<T>]>;
alloc/src/boxed.rs:588:5                       alloc::boxed::Box<[T]>                           fn new_zeroed_slice(len: usize) -> Box<[mem::MaybeUninit<T>]>;
alloc/src/boxed.rs:694:5                       alloc::boxed::Box<[T], A>                        fn new_uninit_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>;
alloc/src/boxed.rs:723:5                       alloc::boxed::Box<[T], A>                        fn new_zeroed_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>;
alloc/src/collections/binary_heap.rs:367:5     alloc::collections::binary_heap::BinaryHeap<T>   fn new() -> BinaryHeap<T>;
alloc/src/collections/binary_heap.rs:386:5     alloc::collections::binary_heap::BinaryHeap<T>   fn with_capacity(capacity: usize) -> BinaryHeap<T>;
alloc/src/collections/btree/map.rs:505:5       alloc::collections::btree_map::BTreeMap<K, V>    const fn new() -> BTreeMap<K, V>;
alloc/src/collections/btree/set.rs:251:5       alloc::collections::btree_set::BTreeSet<T>       const fn new() -> BTreeSet<T>;
alloc/src/collections/linked_list.rs:420:5     alloc::collections::linked_list::LinkedList<T>   const fn new() -> Self;
alloc/src/collections/vec_deque/mod.rs:478:5   alloc::collections::vec_deque::VecDeque<T>       fn new() -> VecDeque<T>;
alloc/src/collections/vec_deque/mod.rs:493:5   alloc::collections::vec_deque::VecDeque<T>       fn with_capacity(capacity: usize) -> VecDeque<T>;
alloc/src/raw_vec.rs:72:5                      alloc::raw_vec::RawVec<T, Global>                const fn new() -> Self;
alloc/src/raw_vec.rs:91:5                      alloc::raw_vec::RawVec<T, Global>                fn with_capacity(capacity: usize) -> Self;
alloc/src/raw_vec.rs:98:5                      alloc::raw_vec::RawVec<T, Global>                fn with_capacity_zeroed(capacity: usize) -> Self;
alloc/src/rc.rs:455:5                          alloc::rc::Rc<T>                                 fn new_uninit() -> Rc<mem::MaybeUninit<T>>;
alloc/src/rc.rs:487:5                          alloc::rc::Rc<T>                                 fn new_zeroed() -> Rc<mem::MaybeUninit<T>>;
alloc/src/rc.rs:592:5                          alloc::rc::Rc<T>                                 fn pin(value: T) -> Pin<Rc<T>>;
alloc/src/rc.rs:661:5                          alloc::rc::Rc<T>                                 fn new_uninit_slice(len: usize) -> Rc<[mem::MaybeUninit<T>]>;
alloc/src/rc.rs:687:5                          alloc::rc::Rc<T>                                 fn new_zeroed_slice(len: usize) -> Rc<[mem::MaybeUninit<T>]>;
alloc/src/rc.rs:2047:5                         alloc::rc::Weak<T>                               fn new() -> Weak<T>;
alloc/src/string.rs:381:5                      alloc::string::String                            const fn new() -> String;
alloc/src/string.rs:425:5                      alloc::string::String                            fn with_capacity(capacity: usize) -> String;
alloc/src/sync.rs:451:5                        alloc::sync::Arc<T>                              fn new_uninit() -> Arc<mem::MaybeUninit<T>>;
alloc/src/sync.rs:483:5                        alloc::sync::Arc<T>                              fn new_zeroed() -> Arc<mem::MaybeUninit<T>>;
alloc/src/sync.rs:499:5                        alloc::sync::Arc<T>                              fn pin(data: T) -> Pin<Arc<T>>;
alloc/src/sync.rs:665:5                        alloc::sync::Arc<[T]>                            fn new_uninit_slice(len: usize) -> Arc<[mem::MaybeUninit<T>]>;
alloc/src/sync.rs:691:5                        alloc::sync::Arc<[T]>                            fn new_zeroed_slice(len: usize) -> Arc<[mem::MaybeUninit<T>]>;
alloc/src/sync.rs:1681:5                       alloc::sync::Weak<T>                             fn new() -> Weak<T>;
alloc/src/vec/mod.rs:423:5                     alloc::vec::Vec<T>                               const fn new() -> Self;
alloc/src/vec/mod.rs:467:5                     alloc::vec::Vec<T>                               fn with_capacity(capacity: usize) -> Self;

Add #[must_use] to core and std constructors #89729

core/src/alloc/layout.rs:123:5           core::alloc::Layout                         const fn new<T>() -> Self;
core/src/hash/sip.rs:160:5               core::hash::SipHasher                       fn new() -> SipHasher;
core/src/hash/sip.rs:171:5               core::hash::SipHasher                       fn new_with_keys(key0: u64, key1: u64) -> SipHasher;
core/src/lazy.rs:86:5                    core::lazy::Lazy                            const fn new() -> OnceCell<T>;
core/src/mem/maybe_uninit.rs:317:5       core::mem::MaybeUninit<T>                   const fn uninit() -> MaybeUninit<T>;
core/src/mem/maybe_uninit.rs:353:5       core::mem::MaybeUninit<T>                   const fn uninit_array<const LEN: usize>() -> [Self; LEN];
core/src/mem/maybe_uninit.rs:396:5       core::mem::MaybeUninit<T>                   fn zeroed() -> MaybeUninit<T>;
core/src/num/nonzero.rs:54:17            core::num::NonZero$Int                      const unsafe fn new_unchecked(n: $Int) -> Self;
core/src/num/nonzero.rs:63:17            core::num::NonZero$Int                      const fn new(n: $Int) -> Option<Self>;
core/src/sync/atomic.rs:293:5            core::sync::atomic::AtomicBool              const fn new(v: bool) -> AtomicBool;
core/src/sync/atomic.rs:1395:13          core::sync::atomic::Atomic$int_type         const fn new(v: $int_type) -> Self;
core/src/task/wake.rs:42:5               core::task::RawWaker                        const fn new(data: *const (), vtable: &'static RawWakerVTable) -> RawWaker;
core/src/time.rs:184:5                   core::time::Duration                        const fn new(secs: u64, nanos: u32) -> Duration;
std/src/collections/hash/map.rs:227:5    std::collections::hash_map::HashMap<K, V>   fn new() -> HashMap<K, V, RandomState>;
std/src/collections/hash/map.rs:244:5    std::collections::hash_map::HashMap<K, V>   fn with_capacity(capacity: usize) -> HashMap<K, V, RandomState>;
std/src/collections/hash/map.rs:2895:5   std::collections::hash_map::RandomState     fn new() -> RandomState;
std/src/collections/hash/map.rs:2946:5   std::collections::hash_map::DefaultHasher   fn new() -> DefaultHasher;
std/src/collections/hash/set.rs:130:5    std::collections::hash_set::HashSet<T>      fn new() -> HashSet<T, RandomState>;
std/src/collections/hash/set.rs:148:5    std::collections::hash_set::HashSet<T>      fn with_capacity(capacity: usize) -> HashSet<T, RandomState>;
std/src/ffi/os_str.rs:123:5              std::ffi::OsString                          fn new() -> OsString;
std/src/ffi/os_str.rs:203:5              std::ffi::OsString                          fn with_capacity(capacity: usize) -> OsString;
std/src/fs.rs:725:5                      std::fs::OpenOptions                        fn new() -> Self;
std/src/fs.rs:2165:5                     std::fs::DirBuilder                         fn new() -> DirBuilder;
std/src/io/mod.rs:1199:5                 std::io::IoSlice<'a>                        fn new(buf: &'a [u8]) -> IoSlice<'a>;
std/src/lazy.rs:174:5                    std::lazy::SyncOnceCell<T>                  const fn new() -> SyncOnceCell<T>;
std/src/net/addr.rs:134:5                std::net::SocketAddr                        fn new(ip: IpAddr, port: u16) -> SocketAddr;
std/src/net/addr.rs:275:5                std::net::SocketAddrV4                      fn new(ip: Ipv4Addr, port: u16) -> SocketAddrV4;
std/src/net/addr.rs:371:5                std::net::SocketAddrV6                      fn new(ip: Ipv6Addr, port: u16, flowinfo: u32, scope_id: u32) -> SocketAddrV6;
std/src/net/ip.rs:446:5                  std::net::Ipv4Addr                          const fn new(a: u8, b: u8, c: u8, d: u8) -> Ipv4Addr;
std/src/net/ip.rs:1196:5                 std::net::Ipv6Addr                          const fn new(a: u16, b: u16, c: u16, d: u16, e: u16, f: u16, g: u16, h: u16) -> Ipv6Addr;
std/src/os/unix/net/ancillary.rs:192:5   std::os::unix::net::SocketCred              fn new() -> SocketCred;
std/src/path.rs:1149:5                   std::path::PathBuf                          fn new() -> PathBuf;
std/src/path.rs:1173:5                   std::path::PathBuf                          fn with_capacity(capacity: usize) -> PathBuf;
std/src/sync/barrier.rs:83:5             std::sync::Barrier                          fn new(n: usize) -> Barrier;
std/src/sync/condvar.rs:124:5            std::sync::Condvar                          fn new() -> Condvar;
std/src/sync/once.rs:189:5               std::sync::Once                             const fn new() -> Once;

Add #[must_use] to MaybeUninit::new #89769

core/src/mem/maybe_uninit.rs:295   core::mem::MaybeUninit<T>   fn new(val: T) -> MaybeUninit<T>;

Add #[must_use] to from_value conversions #89753

alloc/src/str.rs:593:1               alloc::str                    unsafe fn from_boxed_utf8_unchecked(v: Box<[u8]>) -> Box<str>;
alloc/src/string.rs:765:5            alloc::string::String         unsafe fn from_utf8_unchecked(bytes: Vec<u8>) -> String;
core/src/alloc/layout.rs:98:5        core::alloc::Layout           const unsafe fn from_size_align_unchecked(size: usize, align: usize) -> Self;
core/src/char/convert.rs:53:1        core::char                    fn from_u32(i: u32) -> Option<char>;
core/src/char/convert.rs:92:1        core::char                    unsafe fn from_u32_unchecked(i: u32) -> char;
core/src/char/convert.rs:323:1       core::char                    fn from_digit(num: u32, radix: u32) -> Option<char>;
core/src/char/methods.rs:140:5       char                          fn from_u32(i: u32) -> Option<char>;
core/src/char/methods.rs:181:5       char                          unsafe fn from_u32_unchecked(i: u32) -> char;
core/src/char/methods.rs:237:5       char                          fn from_digit(num: u32, radix: u32) -> Option<char>;
core/src/num/f32.rs:790:5            core::num::f32                const fn from_bits(v: u32) -> Self;
core/src/num/f32.rs:868:5            core::num::f32                const fn from_be_bytes(bytes: [u8; 4]) -> Self;
core/src/num/f32.rs:883:5            core::num::f32                const fn from_le_bytes(bytes: [u8; 4]) -> Self;
core/src/num/f32.rs:909:5            core::num::f32                const fn from_ne_bytes(bytes: [u8; 4]) -> Self;
core/src/num/f64.rs:804:5            core::num::f64                const fn from_bits(v: u64) -> Self;
core/src/num/f64.rs:882:5            core::num::f64                const fn from_be_bytes(bytes: [u8; 8]) -> Self;
core/src/num/f64.rs:897:5            core::num::f64                const fn from_le_bytes(bytes: [u8; 8]) -> Self;
core/src/num/f64.rs:923:5            core::num::f64                const fn from_ne_bytes(bytes: [u8; 8]) -> Self;
core/src/num/int_macros.rs:286:9     $Int                          const fn from_be(x: Self) -> Self;
core/src/num/int_macros.rs:317:9     $Int                          const fn from_le(x: Self) -> Self;
core/src/num/int_macros.rs:2434:9    $Int                          const fn from_be_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self;
core/src/num/int_macros.rs:2464:9    $Int                          const fn from_le_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self;
core/src/num/int_macros.rs:2507:9    $Int                          const fn from_ne_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self;
core/src/num/saturating.rs:648:13    core::num::Saturating<$Int>   const fn from_be(x: Self) -> Self;
core/src/num/saturating.rs:675:13    core::num::Saturating<$Int>   const fn from_le(x: Self) -> Self;
core/src/num/uint_macros.rs:289:9    $Int                          const fn from_be(x: Self) -> Self;
core/src/num/uint_macros.rs:321:9    $Int                          const fn from_le(x: Self) -> Self;
core/src/num/uint_macros.rs:2182:9   $Int                          const fn from_be_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self;
core/src/num/uint_macros.rs:2212:9   $Int                          const fn from_le_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self;
core/src/num/uint_macros.rs:2255:9   $Int                          const fn from_ne_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self;
core/src/num/wrapping.rs:642:13      core::num::Wrapping<$Int>     const fn from_be(x: Self) -> Self;
core/src/num/wrapping.rs:669:13      core::num::Wrapping<$Int>     const fn from_le(x: Self) -> Self;
core/src/str/converts.rs:160:1       core::str                     const unsafe fn from_utf8_unchecked(v: &[u8]) -> &str;
core/src/str/converts.rs:186:1       core::str                     const unsafe fn from_utf8_unchecked_mut(v: &mut [u8]) -> &mut str;
core/src/str/lossy.rs:15:5           core::str::lossy::Utf8Lossy   fn from_str(s: &str) -> &Utf8Lossy;
core/src/str/lossy.rs:19:5           core::str::lossy::Utf8Lossy   fn from_bytes(bytes: &[u8]) -> &Utf8Lossy;
core/src/task/wake.rs:162:5          core::task::Context<'a>       fn from_waker(waker: &'a Waker) -> Self;
core/src/task/wake.rs:255:5          core::task::Waker             unsafe fn from_raw(waker: RawWaker) -> Waker;
core/src/time.rs:208:5               core::time::Duration          const fn from_secs(secs: u64) -> Duration;
core/src/time.rs:227:5               core::time::Duration          const fn from_millis(millis: u64) -> Duration;
core/src/time.rs:249:5               core::time::Duration          const fn from_micros(micros: u64) -> Duration;
core/src/time.rs:271:5               core::time::Duration          const fn from_nanos(nanos: u64) -> Duration;
core/src/time.rs:697:5               core::time::Duration          const fn from_secs_f64(secs: f64) -> Duration;
core/src/time.rs:758:5               core::time::Duration          const fn from_secs_f32(secs: f32) -> Duration;
std/src/ffi/c_str.rs:429:5           std::ffi::CString             unsafe fn from_vec_unchecked(mut v: Vec<u8>) -> CString;
std/src/ffi/c_str.rs:482:5           std::ffi::CString             unsafe fn from_raw(ptr: *mut c_char) -> CString;
std/src/ffi/c_str.rs:705:5           std::ffi::CString             unsafe fn from_vec_with_nul_unchecked(v: Vec<u8>) -> Self;
std/src/ffi/c_str.rs:1166:5          std::ffi::CStr                unsafe fn from_ptr<'a>(ptr: *const c_char) -> &'a CStr;
std/src/ffi/c_str.rs:1249:5          std::ffi::CStr                const unsafe fn from_bytes_with_nul_unchecked(bytes: &[u8]) -> &CStr;
std/src/io/error.rs:477:5            std::io::Error                fn from_raw_os_error(code: i32) -> Error;

Add #[must_use] to conversions that move self #89755

alloc/src/collections/binary_heap.rs:852:5       alloc::collections::binary_heap::BinaryHeap<T>              fn into_iter_sorted(self) -> IntoIterSorted<T>;
alloc/src/collections/binary_heap.rs:1032:5      alloc::collections::binary_heap::BinaryHeap<T>              fn into_vec(self) -> Vec<T>;
alloc/src/collections/btree/map.rs:1268:5        alloc::collections::btree_map::BTreeMap<K, V>               fn into_keys(self) -> IntoKeys<K, V>;
alloc/src/collections/btree/map.rs:1290:5        alloc::collections::btree_map::BTreeMap<K, V>               fn into_values(self) -> IntoValues<K, V>;
alloc/src/collections/btree/map/entry.rs:452:5   alloc::collections::btree_map::OccupiedEntry<'a, K, V>      fn into_mut(self) -> &'a mut V;
alloc/src/rc.rs:2134:5                           alloc::rc::Weak<T>                                          fn into_raw(self) -> *const T;
alloc/src/string.rs:680:5                        alloc::string::String                                       fn into_raw_parts(self) -> (*mut u8, usize, usize);
alloc/src/string.rs:785:5                        alloc::string::String                                       fn into_bytes(self) -> Vec<u8>;
alloc/src/string.rs:1742:5                       alloc::string::String                                       fn into_boxed_str(self) -> Box<str>;
alloc/src/string.rs:1787:5                       alloc::string::FromUtf8Error                                fn into_bytes(self) -> Vec<u8>;
alloc/src/sync.rs:739:5                          alloc::sync::Arc<MaybeUninit<T>>                            unsafe fn assume_init(self) -> Arc<T>;
alloc/src/sync.rs:780:5                          alloc::sync::Arc<[MaybeUninit<T>]>                          unsafe fn assume_init(self) -> Arc<[T]>;
alloc/src/sync.rs:1763:5                         alloc::sync::Weak<T>                                        fn into_raw(self) -> *const T;
core/src/option.rs:1477:5                        core::option::Option<&mut T>                                fn copied(self) -> Option<T>;
core/src/option.rs:1515:5                        core::option::Option<&mut T>                                fn cloned(self) -> Option<T>;
core/src/pin.rs:720:5                            core::pin::Pin<&'a mut T>                                   const fn into_ref(self) -> Pin<&'a T>;
core/src/pin.rs:736:5                            core::pin::Pin<&'a mut T>                                   const fn get_mut(self) -> &'a mut T;
core/src/pin.rs:756:5                            core::pin::Pin<&'a mut T>                                   const unsafe fn get_unchecked_mut(self) -> &'a mut T;
core/src/pin.rs:779:5                            core::pin::Pin<&'a mut T>                                   unsafe fn map_unchecked_mut(self, func: F) -> Pin<&'a mut U>;
core/src/pin.rs:815:5                            core::pin::Pin<&'a mut Pin<P>>                              fn as_deref_mut(self) -> Pin<&'a mut P::Target>;
core/src/ptr/unique.rs:105:5                     core::mem::Unique<T>                                        const fn as_ptr(self) -> *mut T;
core/src/ptr/unique.rs:135:5                     core::mem::Unique<T>                                        const fn cast<U>(self) -> Unique<U>;
core/src/slice/iter.rs:271:5                     core::slice::IterMut<'a, T>                                 fn into_slice(self) -> &'a mut [T];
core/src/slice/iter.rs:1873:5                    core::slice::ChunksExactMut<'a, T>                          fn into_remainder(self) -> &'a mut [T];
core/src/slice/iter.rs:2268:5                    core::slice::ArrayChunksMut<'a, T, N>                       fn into_remainder(self) -> &'a mut [T];
core/src/slice/iter.rs:2879:5                    core::slice::RChunksExactMut<'a, T>                         fn into_remainder(self) -> &'a mut [T];
std/src/collections/hash/map.rs:1724:5           std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn into_key(self) -> &'a mut K;
std/src/collections/hash/map.rs:1739:5           std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn into_mut(self) -> &'a mut V;
std/src/collections/hash/map.rs:1768:5           std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn into_key_value(self) -> (&'a mut K, &'a mut V);
std/src/ffi/c_str.rs:325:5                       std::ffi:FromVecWithNulError                                fn into_bytes(self) -> Vec<u8>;
std/src/ffi/c_str.rs:528:5                       std::ffi::CString                                           fn into_raw(self) -> *mut c_char;
std/src/ffi/c_str.rs:575:5                       std::ffi::CString                                           fn into_bytes(self) -> Vec<u8>;
std/src/ffi/c_str.rs:595:5                       std::ffi::CString                                           fn into_bytes_with_nul(self) -> Vec<u8>;
std/src/ffi/c_str.rs:671:5                       std::ffi::CString                                           fn into_boxed_c_str(self) -> Box<CStr>;
std/src/ffi/c_str.rs:1022:5                      std::ffi::NulError                                          fn into_vec(self) -> Vec<u8>;
std/src/ffi/c_str.rs:1096:5                      std::ffi::IntoStringError                                   fn into_cstring(self) -> CString;
std/src/ffi/os_str.rs:350:5                      std::ffi::OsString                                          fn into_boxed_os_str(self) -> Box<OsStr>;
std/src/io/buffered/bufwriter.rs:480:5           std::io::BufWriter<W>                                       fn into_inner(self) -> Vec<u8>;
std/src/io/error.rs:661:5                        std::io::Error                                              fn into_inner(self) -> Option<Box<dyn error::Error + Send + Sync>>;
std/src/io/stdio.rs:467:5                        std::io::Stdin                                              fn lines(self) -> Lines<StdinLock<'static>>;
std/src/net/tcp.rs:887:5                         std::net::TcpListener                                       fn into_incoming(self) -> IntoIncoming;
std/src/path.rs:536:5                            std::path::Component<'a>                                    fn as_os_str(self) -> &'a OsStr;
std/src/path.rs:1432:5                           std::path::PathBuf                                          fn into_os_string(self) -> OsString;
std/src/path.rs:1439:5                           std::path::PathBuf                                          fn into_boxed_path(self) -> Box<Path>;

Add #[must_use] to From::from and Into::into #89770

core/src/convert/mod.rs:280   core::convert::Into<T>   fn into(self) -> T;
core/src/convert/mod.rs:375   core::convert::From<T>   fn from(_: T) -> Self;

Add #[must_use] to as_type conversions #89778

alloc/src/collections/binary_heap.rs:1010:5   alloc::collections::binary_heap::BinaryHeap<T>      fn as_slice(&self) -> &[T];
alloc/src/collections/linked_list.rs:1388:5   alloc::collections::linked_list::CursorMut<'a, T>   fn as_cursor(&self) -> Cursor<'_, T>;
alloc/src/rc.rs:2091:5                        alloc::rc::Weak<T>                                  fn as_ptr(&self) -> *const T;
alloc/src/string.rs:802:5                     alloc::string::String                               fn as_str(&self) -> &str;
alloc/src/string.rs:825:5                     alloc::string::String                               fn as_mut_str(&mut self) -> &mut str;
alloc/src/string.rs:1162:5                    alloc::string::String                               fn as_bytes(&self) -> &[u8];
alloc/src/string.rs:1764:5                    alloc::string::FromUtf8Error                        fn as_bytes(&self) -> &[u8];
alloc/src/string.rs:2779:5                    alloc::string::Drain<'a>                            fn as_str(&self) -> &str;
alloc/src/sync.rs:824:5                       alloc::sync::Arc<T>                                 fn as_ptr(this: &Self) -> *const T;
alloc/src/sync.rs:1720:5                      alloc::sync::Weak<T>                                fn as_ptr(&self) -> *const T;
alloc/src/vec/drain.rs:56:5                   alloc::vec::Drain<'a, T, A>                         fn as_slice(&self) -> &[T];
core/src/fmt/mod.rs:495:5                     core::fmt::Arguments<'a>                            const fn as_str(&self) -> Option<&'static str>;
core/src/option.rs:661:5                      core::option::Option<T>                             fn as_pin_ref(self: Pin<&Self>) -> Option<Pin<&T>>;
core/src/option.rs:672:5                      core::option::Option<T>                             fn as_pin_mut(self: Pin<&mut Self>) -> Option<Pin<&mut T>>;
core/src/ptr/non_null.rs:123:5                core::mem::NonNull<T>                               unsafe fn as_uninit_ref<'a>(&self) -> &'a MaybeUninit<T>;
core/src/ptr/non_null.rs:156:5                core::mem::NonNull<T>                               unsafe fn as_uninit_mut<'a>(&mut self) -> &'a MaybeUninit<T>;
core/src/ptr/non_null.rs:268:5                core::mem::NonNull<T>                               const fn as_ptr(self) -> *mut T;
core/src/ptr/non_null.rs:314:5                core::mem::NonNull<T>                               unsafe fn as_ref<'a>(&self) -> &'a T;
core/src/ptr/non_null.rs:368:5                core::mem::NonNull<T>                               unsafe fn as_mut<'a>(&mut self) -> &'a mut T;
core/src/ptr/non_null.rs:460:5                core::mem::NonNull<[T]>                             const fn as_non_null_ptr(self) -> NonNull<T>;
core/src/ptr/non_null.rs:479:5                core::mem::NonNull<[T]>                             const fn as_mut_ptr(self) -> *mut T;
core/src/ptr/non_null.rs:522:5                core::mem::NonNull<[T]>                             unsafe fn as_uninit_slice<'a>(&self) -> &'a [MaybeUninit<T>];
core/src/ptr/non_null.rs:583:5                core::mem::NonNull<[T]>                             unsafe fn as_uninit_slice_mut<'a>(&self) -> &'a mut [MaybeUninit<T>];
core/src/ptr/unique.rs:115:5                  core::mem::Unique<T>                                unsafe fn as_ref(&self) -> &T;
core/src/ptr/unique.rs:130:5                  core::mem::Unique<T>                                unsafe fn as_mut(&mut self) -> &mut T;
core/src/slice/iter.rs:128:5                  core::slice::Iter<'a, T>                            fn as_slice(&self) -> &'a [T];
core/src/slice/iter.rs:301:5                  core::slice::IterMut<'a, T>                         fn as_slice(&self) -> &[T];
core/src/str/iter.rs:113:5                    core::str::Chars<'a>                                fn as_str(&self) -> &'a str;
core/src/str/iter.rs:189:5                    core::str::CharIndices<'a>                          fn as_str(&self) -> &'a str;
core/src/str/iter.rs:1251:5                   core::str::SplitWhitespace<'a>                      fn as_str(&self) -> &'a str;
core/src/str/iter.rs:1306:5                   core::str::SplitAsciiWhitespace<'a>                 fn as_str(&self) -> &'a str;
core/src/str/mod.rs:234:5                     str                                                 const fn as_bytes(&self) -> &[u8];
core/src/str/mod.rs:280:5                     str                                                 unsafe fn as_bytes_mut(&mut self) -> &mut [u8];
core/src/str/mod.rs:307:5                     str                                                 const fn as_ptr(&self) -> *const u8;
core/src/str/mod.rs:326:5                     str                                                 fn as_mut_ptr(&mut self) -> *mut u8;
core/src/time.rs:332:5                        core::time::Duration                                const fn as_secs(&self) -> u64;
core/src/time.rs:415:5                        core::time::Duration                                const fn as_millis(&self) -> u128;
core/src/time.rs:432:5                        core::time::Duration                                const fn as_micros(&self) -> u128;
core/src/time.rs:449:5                        core::time::Duration                                const fn as_nanos(&self) -> u128;
core/src/time.rs:659:5                        core::time::Duration                                const fn as_secs_f64(&self) -> f64;
core/src/time.rs:677:5                        core::time::Duration                                const fn as_secs_f32(&self) -> f32;
std/src/ffi/c_str.rs:300:5                    std::ffi:FromVecWithNulError                        fn as_bytes(&self) -> &[u8];
std/src/ffi/c_str.rs:617:5                    std::ffi::CString                                   fn as_bytes(&self) -> &[u8];
std/src/ffi/c_str.rs:636:5                    std::ffi::CString                                   fn as_bytes_with_nul(&self) -> &[u8];
std/src/ffi/c_str.rs:654:5                    std::ffi::CString                                   fn as_c_str(&self) -> &CStr;
std/src/ffi/c_str.rs:1307:5                   std::ffi::CStr                                      const fn as_ptr(&self) -> *const c_char;
std/src/ffi/os_str.rs:140:5                   std::ffi::OsString                                  fn as_os_str(&self) -> &OsStr;
std/src/os/unix/net/addr.rs:195:5             std::os::unix::net::SocketAddr                      fn as_pathname(&self) -> Option<&Path>;
std/src/path.rs:431:5                         std::path::PrefixComponent<'a>                      fn as_os_str(&self) -> &'a OsStr;
std/src/path.rs:679:5                         std::path::Components<'a>                           fn as_path(&self) -> &'a Path;
std/src/path.rs:824:5                         std::path::Iter<'a>                                 fn as_path(&self) -> &'a Path;
std/src/path.rs:1189:5                        std::path::PathBuf                                  fn as_path(&self) -> &Path;
std/src/path.rs:1922:5                        std::path::Path                                     fn as_os_str(&self) -> &OsStr;
std/src/thread/mod.rs:1035:5                  std::thread::ThreadId                               fn as_u64(&self) -> NonZeroU64;

Add #[must_use] to len and is_empty #89786

alloc/src/collections/binary_heap.rs:1049:5   alloc::collections::binary_heap::BinaryHeap<T>   fn len(&self) -> usize;
alloc/src/collections/binary_heap.rs:1072:5   alloc::collections::binary_heap::BinaryHeap<T>   fn is_empty(&self) -> bool;
alloc/src/collections/btree/map.rs:2207:5     alloc::collections::btree_map::BTreeMap<K, V>    const fn len(&self) -> usize;
alloc/src/collections/btree/map.rs:2227:5     alloc::collections::btree_map::BTreeMap<K, V>    const fn is_empty(&self) -> bool;
alloc/src/collections/btree/set.rs:1035:5     alloc::collections::btree_set::BTreeSet<T>       const fn len(&self) -> usize;
alloc/src/collections/btree/set.rs:1053:5     alloc::collections::btree_set::BTreeSet<T>       const fn is_empty(&self) -> bool;
alloc/src/collections/linked_list.rs:580:5    alloc::collections::linked_list::LinkedList<T>   fn is_empty(&self) -> bool;
alloc/src/collections/linked_list.rs:606:5    alloc::collections::linked_list::LinkedList<T>   fn len(&self) -> usize;
alloc/src/string.rs:1539:5                    alloc::string::String                            fn len(&self) -> usize;
alloc/src/string.rs:1558:5                    alloc::string::String                            fn is_empty(&self) -> bool;
core/src/ptr/non_null.rs:442:5                core::mem::NonNull<[T]>                          const fn len(self) -> usize;
core/src/str/mod.rs:144:5                     str                                              const fn len(&self) -> usize;
core/src/str/mod.rs:164:5                     str                                              const fn is_empty(&self) -> bool;
std/src/ffi/os_str.rs:663:5                   std::ffi::OsStr                                  fn is_empty(&self) -> bool;
std/src/ffi/os_str.rs:694:5                   std::ffi::OsStr                                  fn len(&self) -> usize;
std/src/fs.rs:1059:5                          std::fs::MetaData                                fn len(&self) -> u64;
std/src/os/unix/net/ancillary.rs:434:5        std::os::unix::net::SocketAncillary<'a>          fn is_empty(&self) -> bool;
std/src/os/unix/net/ancillary.rs:440:5        std::os::unix::net::SocketAncillary<'a>          fn len(&self) -> usize;

Add #[must_use] to thread::Builder #89789

std/src/thread/mod.rs:289:5   std::thread::Builder   fn new() -> Builder;
std/src/thread/mod.rs:318:5   std::thread::Builder   fn name(mut self, name: String) -> Builder;
std/src/thread/mod.rs:341:5   std::thread::Builder   fn stack_size(mut self, size: usize) -> Builder;

Add #[must_use] to to_value conversions #89794

core/src/ptr/non_null.rs:244:5   core::mem::NonNull<T>   const fn to_raw_parts(self) -> (NonNull<()>, <T as super::Pointee>::Metadata);
core/src/ptr/non_null.rs:385:5   core::mem::NonNull<T>   const fn cast<U>(self) -> NonNull<U>;
core/src/char/methods.rs:332:5   char                    fn to_digit(self, radix: u32) -> Option<u32>;
std/src/ffi/c_str.rs:1330:5      std::ffi::CStr          fn to_bytes(&self) -> &[u8];
std/src/ffi/c_str.rs:1355:5      std::ffi::CStr          fn to_bytes_with_nul(&self) -> &[u8];
std/src/ffi/c_str.rs:1425:5      std::ffi::CStr          fn to_string_lossy(&self) -> Cow<'_, str>;
std/src/ffi/os_str.rs:576:5      std::ffi::OsStr         fn to_str(&self) -> Option<&str>;
std/src/ffi/os_str.rs:627:5      std::ffi::OsStr         fn to_string_lossy(&self) -> Cow<'_, str>;
std/src/ffi/os_str.rs:644:5      std::ffi::OsStr         fn to_os_string(&self) -> OsString;
std/src/net/ip.rs:423:5          std::net::IpAddr        const fn to_canonical(&self) -> IpAddr;
std/src/net/ip.rs:885:5          std::net::Ipv4Addr      const fn to_ipv6_compatible(&self) -> Ipv6Addr;
std/src/net/ip.rs:910:5          std::net::Ipv4Addr      const fn to_ipv6_mapped(&self) -> Ipv6Addr;
std/src/net/ip.rs:1621:5         std::net::Ipv6Addr      const fn to_ipv4_mapped(&self) -> Option<Ipv4Addr>;
std/src/net/ip.rs:1658:5         std::net::Ipv6Addr      const fn to_ipv4(&self) -> Option<Ipv4Addr>;
std/src/net/ip.rs:1683:5         std::net::Ipv6Addr      const fn to_canonical(&self) -> IpAddr;
std/src/path.rs:1944:5           std::path::Path         fn to_str(&self) -> Option<&str>;
std/src/path.rs:1970:5           std::path::Path         fn to_string_lossy(&self) -> Cow<'_, str>;
std/src/path.rs:1986:5           std::path::Path         fn to_path_buf(&self) -> PathBuf;

Add #[must_use] to non-mutating verb methods #89796

alloc/src/rc.rs:2226:5           alloc::rc::Weak<T>     fn upgrade(&self) -> Option<Rc<T>>;
alloc/src/sync.rs:894:5          alloc::sync::Arc<T>    fn downgrade(this: &Self) -> Weak<T>;
alloc/src/sync.rs:1856:5         alloc::sync::Weak<T>   fn upgrade(&self) -> Option<Arc<T>>;
core/src/alloc/layout.rs:115:5   core::alloc::Layout    const fn align(&self) -> usize;
core/src/alloc/layout.rs:231:5   core::alloc::Layout    const fn padding_needed_for(&self, align: usize) -> usize;
core/src/alloc/layout.rs:264:5   core::alloc::Layout    fn pad_to_align(&self) -> Layout;
std/src/path.rs:2510:5           std::path::Path        fn display(&self) -> Display<'_>;

Add #[must_use] to is_condition tests #89797

std/src/fs.rs:986:5                 std::fs::MetaData                fn is_dir(&self) -> bool;
std/src/fs.rs:1014:5                std::fs::MetaData                fn is_file(&self) -> bool;
std/src/fs.rs:1040:5                std::fs::MetaData                fn is_symlink(&self) -> bool;
std/src/fs.rs:1287:5                std::fs::FileType                fn is_dir(&self) -> bool;
std/src/fs.rs:1319:5                std::fs::FileType                fn is_file(&self) -> bool;
std/src/fs.rs:1354:5                std::fs::FileType                fn is_symlink(&self) -> bool;
std/src/net/addr.rs:236:5           std::net::SocketAddr             const fn is_ipv4(&self) -> bool;
std/src/net/addr.rs:257:5           std::net::SocketAddr             const fn is_ipv6(&self) -> bool;
std/src/net/ip.rs:237:5             std::net::IpAddr                 const fn is_unspecified(&self) -> bool;
std/src/net/ip.rs:260:5             std::net::IpAddr                 const fn is_loopback(&self) -> bool;
std/src/net/ip.rs:285:5             std::net::IpAddr                 const fn is_global(&self) -> bool;
std/src/net/ip.rs:308:5             std::net::IpAddr                 const fn is_multicast(&self) -> bool;
std/src/net/ip.rs:336:5             std::net::IpAddr                 const fn is_documentation(&self) -> bool;
std/src/net/ip.rs:360:5             std::net::IpAddr                 const fn is_benchmarking(&self) -> bool;
std/src/net/ip.rs:383:5             std::net::IpAddr                 const fn is_ipv4(&self) -> bool;
std/src/net/ip.rs:403:5             std::net::IpAddr                 const fn is_ipv6(&self) -> bool;
std/src/net/ip.rs:530:5             std::net::Ipv4Addr               const fn is_unspecified(&self) -> bool;
std/src/net/ip.rs:551:5             std::net::Ipv4Addr               const fn is_loopback(&self) -> bool;
std/src/net/ip.rs:581:5             std::net::Ipv4Addr               const fn is_private(&self) -> bool;
std/src/net/ip.rs:608:5             std::net::Ipv4Addr               const fn is_link_local(&self) -> bool;
std/src/net/ip.rs:683:5             std::net::Ipv4Addr               const fn is_global(&self) -> bool;
std/src/net/ip.rs:723:5             std::net::Ipv4Addr               const fn is_shared(&self) -> bool;
std/src/net/ip.rs:748:5             std::net::Ipv4Addr               const fn is_benchmarking(&self) -> bool;
std/src/net/ip.rs:782:5             std::net::Ipv4Addr               const fn is_reserved(&self) -> bool;
std/src/net/ip.rs:805:5             std::net::Ipv4Addr               const fn is_multicast(&self) -> bool;
std/src/net/ip.rs:826:5             std::net::Ipv4Addr               const fn is_broadcast(&self) -> bool;
std/src/net/ip.rs:853:5             std::net::Ipv4Addr               const fn is_documentation(&self) -> bool;
std/src/net/ip.rs:1293:5            std::net::Ipv6Addr               const fn is_unspecified(&self) -> bool;
std/src/net/ip.rs:1316:5            std::net::Ipv6Addr               const fn is_loopback(&self) -> bool;
std/src/net/ip.rs:1342:5            std::net::Ipv6Addr               const fn is_global(&self) -> bool;
std/src/net/ip.rs:1369:5            std::net::Ipv6Addr               const fn is_unique_local(&self) -> bool;
std/src/net/ip.rs:1397:5            std::net::Ipv6Addr               const fn is_unicast(&self) -> bool;
std/src/net/ip.rs:1448:5            std::net::Ipv6Addr               const fn is_unicast_link_local(&self) -> bool;
std/src/net/ip.rs:1472:5            std::net::Ipv6Addr               const fn is_documentation(&self) -> bool;
std/src/net/ip.rs:1494:5            std::net::Ipv6Addr               const fn is_benchmarking(&self) -> bool;
std/src/net/ip.rs:1531:5            std::net::Ipv6Addr               const fn is_unicast_global(&self) -> bool;
std/src/net/ip.rs:1592:5            std::net::Ipv6Addr               const fn is_multicast(&self) -> bool;
std/src/os/unix/net/addr.rs:160:5   std::os::unix::net::SocketAddr   fn is_unnamed(&self) -> bool;
std/src/path.rs:219:5               std::path::Prefix<'a>            fn is_verbatim(&self) -> bool;
std/src/path.rs:251:1               std::path                        fn is_separator(c: char) -> bool;
std/src/path.rs:2010:5              std::path::Path                  fn is_absolute(&self) -> bool;
std/src/path.rs:2034:5              std::path::Path                  fn is_relative(&self) -> bool;
std/src/path.rs:2060:5              std::path::Path                  fn has_root(&self) -> bool;
std/src/path.rs:2696:5              std::path::Path                  fn is_file(&self) -> bool;
std/src/path.rs:2722:5              std::path::Path                  fn is_dir(&self) -> bool;
std/src/path.rs:2748:5              std::path::Path                  fn is_symlink(&self) -> bool;
std/src/sync/barrier.rs:169:5       std::sync::BarrierWaitResult     fn is_leader(&self) -> bool;

Add #[must_use] to Rc::downgrade #89833

alloc/src/sync.rs:895:5   alloc::sync::Rc<T>   fn downgrade(this: &Self) -> Weak<T>;

Add #[must_use] to expensive computations #89835

alloc/src/collections/btree/set.rs:308:5                    alloc::collections::btree_set::BTreeSet<T>                  fn difference<'a>(&'a self, other: &'a BTreeSet<T>) -> Difference<'a, T>;
alloc/src/collections/btree/set.rs:369:5                    alloc::collections::btree_set::BTreeSet<T>                  fn symmetric_difference<'a>(&'a self, other: &'a BTreeSet<T>) -> SymmetricDifference<'a, T>
alloc/src/collections/btree/set.rs:397:5                    alloc::collections::btree_set::BTreeSet<T>                  fn intersection<'a>(&'a self, other: &'a BTreeSet<T>) -> Intersection<'a, T>;
alloc/src/collections/btree/set.rs:448:5                    alloc::collections::btree_set::BTreeSet<T>                  fn union<'a>(&'a self, other: &'a BTreeSet<T>) -> Union<'a, T>;
alloc/src/string.rs:555:5                                   alloc::string::String                                       fn from_utf8_lossy(v: &[u8]) -> Cow<'_, str>;
alloc/src/string.rs:649:5                                   alloc::string::String                                       fn from_utf16_lossy(v: &[u16]) -> String;
core/src/slice/ascii.rs:15:5                                slice                                                       fn is_ascii(&self) -> bool;
core/src/slice/ascii.rs:25:5                                slice                                                       fn eq_ignore_ascii_case(&self, other: &[u8]) -> bool;
core/src/slice/memchr.rs:41:1                               core::slice                                                 fn memchr(x: u8, text: &[u8]) -> Option<usize>;
core/src/slice/memchr.rs:94:1                               core::slice                                                 fn memrchr(x: u8, text: &[u8]) -> Option<usize>;
core/src/str/lossy.rs:24:5                                  core::str::lossy::Utf8Lossy                                 fn chunks(&self) -> Utf8LossyChunksIter<'_>;
core/src/str/mod.rs:678:5                                   str                                                         fn chars(&self) -> Chars<'_>;
core/src/str/mod.rs:735:5                                   str                                                         fn char_indices(&self) -> CharIndices<'_>;
core/src/str/mod.rs:890:5                                   str                                                         fn lines(&self) -> Lines<'_>;
core/src/str/mod.rs:899:5                                   str                                                         fn lines_any(&self) -> LinesAny<'_>;
core/src/str/mod.rs:2236:5                                  str                                                         fn is_ascii(&self) -> bool;
core/src/str/mod.rs:2257:5                                  str                                                         fn eq_ignore_ascii_case(&self, other: &str) -> bool;
std/src/collections/hash/set.rs:512:5                       std::collections::HashSet<T, S>                             fn difference<'a>(&'a self, other: &'a HashSet<T, S>) -> Difference<'a, T, S>;
std/src/collections/hash/set.rs:541:5                       std::collections::HashSet<T, S>                             fn symmetric_difference<'a>(&'a self, other: &'a HashSet<T, S>) -> SymmetricDifference<'a, T, S>
std/src/collections/hash/set.rs:570:5                       std::collections::HashSet<T, S>                             fn intersection<'a>(&'a self, other: &'a HashSet<T, S>) -> Intersection<'a, T, S>;
std/src/collections/hash/set.rs:600:5                       std::collections::HashSet<T, S>                             fn union<'a>(&'a self, other: &'a HashSet<T, S>) -> Union<'a, T, S>;
std/src/ffi/os_str.rs:821:5                                 std::ffi::OsStr                                             fn is_ascii(&self) -> bool;
std/src/io/stdio.rs:489:5                                   std::io::Stdin                                              fn split(self, byte: u8) -> Split<StdinLock<'static>>;

Add #[must_use] to mem/ptr functions #89839

core/src/mem/mod.rs:303:1        core::mem                 const fn size_of<T>() -> usize;
core/src/mem/mod.rs:332:1        core::mem                 const fn size_of_val<T: ?Sized>(val: &T) -> usize;
core/src/mem/mod.rs:381:1        core::mem                 const unsafe fn size_of_val_raw<T: ?Sized>(val: *const T) -> usize;
core/src/mem/mod.rs:402:1        core::mem                 fn min_align_of<T>() -> usize;
core/src/mem/mod.rs:428:1        core::mem                 fn min_align_of_val<T: ?Sized>(val: &T) -> usize;
core/src/mem/mod.rs:447:1        core::mem                 const fn align_of<T>() -> usize;
core/src/mem/mod.rs:474:1        core::mem                 const fn align_of_val<T: ?Sized>(val: &T) -> usize;
core/src/mem/mod.rs:520:1        core::mem                 const fn align_of_val_raw<T: ?Sized>(val: *const T) -> usize;
core/src/mem/mod.rs:577:1        core::mem                 const fn needs_drop<T>() -> bool;
core/src/mem/mod.rs:626:1        core::mem                 unsafe fn zeroed<T>() -> T;
core/src/mem/mod.rs:662:1        core::mem                 unsafe fn uninitialized<T>() -> T;
core/src/mem/mod.rs:955:1        core::mem                 const unsafe fn transmute_copy<T, U>(src: &T) -> U;
core/src/mem/mod.rs:1056:1       core::mem                 const fn variant_count<T>() -> usize;
core/src/ptr/mod.rs:211:1        core::ptr                 const fn null<T>() -> *const T;
core/src/ptr/mod.rs:230:1        core::ptr                 const fn null_mut<T>() -> *mut T;
core/src/ptr/non_null.rs:87:5    core::ptr::NonNull<T>     const fn dangling() -> Self;
core/src/ptr/non_null.rs:418:5   core::ptr::NonNull<[T]>   const fn slice_from_raw_parts(data: NonNull<T>, len: usize) -> Self;
core/src/ptr/unique.rs:72:5      core::ptr::Unique<T>      const fn dangling() -> Self;

Add #[must_use] to remaining core functions #89897

core/src/alloc/layout.rs:107:5        core::alloc::Layout                  const fn size(&self) -> usize;
core/src/alloc/layout.rs:143:5        core::alloc::Layout                  fn for_value<T: ?Sized>(t: &T) -> Self;
core/src/alloc/layout.rs:177:5        core::alloc::Layout                  unsafe fn for_value_raw<T: ?Sized>(t: *const T) -> Self;
core/src/alloc/layout.rs:187:5        core::alloc::Layout                  const fn dangling(&self) -> NonNull<u8>;
core/src/any.rs:463:5                 core::any::TypeId                    const fn of<T: ?Sized + 'static>() -> TypeId;
core/src/any.rs:497:1                 core::any                            const fn type_name<T: ?Sized>() -> &'static str;
core/src/any.rs:542:1                 core::any                            const fn type_name_of_val<T: ?Sized>(_val: &T) -> &'static str;
core/src/ascii.rs:91:1                core::ascii                          fn escape_default(c: u8) -> EscapeDefault;
core/src/cell.rs:1337:5               core::cell::Ref<'b, T>               fn clone(orig: &Ref<'b, T>) -> Ref<'b, T>;
core/src/cell.rs:1363:5               core::cell::Ref<'b, T>               fn map<U: ?Sized, F>(orig: Ref<'b, T>, f: F) -> Ref<'b, T>;
core/src/cell.rs:1427:5               core::cell::Ref<'b, T>               fn map_split<U: ?Sized, V: ?Sized, F>(orig: Ref<'b, T>, f: F) -> (Ref<'b, U>, Ref<'b, V>);
core/src/char/decode.rs:132:5         core::char::DecodeUtf16Error         fn unpaired_surrogate(&self) -> u16;
core/src/default.rs:159:1             core::default::Default               fn default<T: Default>() -> T;
core/src/fmt/mod.rs:1626:5            core::fmt::Formatter<'a>             fn flags(&self) -> u32;
core/src/fmt/mod.rs:1658:5            core::fmt::Formatter<'a>             fn fill(&self) -> char;
core/src/fmt/mod.rs:1694:5            core::fmt::Formatter<'a>             fn align(&self) -> Option<Alignment>;
core/src/fmt/mod.rs:1728:5            core::fmt::Formatter<'a>             fn width(&self) -> Option<usize>;
core/src/fmt/mod.rs:1758:5            core::fmt::Formatter<'a>             fn precision(&self) -> Option<usize>;
core/src/fmt/mod.rs:1788:5            core::fmt::Formatter<'a>             fn sign_plus(&self) -> bool;
core/src/fmt/mod.rs:1816:5            core::fmt::Formatter<'a>             fn sign_minus(&self) -> bool;
core/src/fmt/mod.rs:1843:5            core::fmt::Formatter<'a>             fn alternate(&self) -> bool;
core/src/fmt/mod.rs:1868:5            core::fmt::Formatter<'a>             fn sign_aware_zero_pad(&self) -> bool;
core/src/future/mod.rs:94:1           core::future                         unsafe fn get_context<'a, 'b>(cx: ResumeTy) -> &'a mut Context<'b>;
core/src/iter/sources/empty.rs:21:1   core::iter                           const fn empty<T>() -> Empty<T>;
core/src/num/error.rs:118:5           core::num::ParseIntError             fn kind(&self) -> &IntErrorKind;
core/src/num/f32.rs:959:5             core::num::f32                       fn total_cmp(&self, other: &Self) -> crate::cmp::Ordering;
core/src/num/f64.rs:973:5             core::num::f64                       fn total_cmp(&self, other: &Self) -> crate::cmp::Ordering;
core/src/ops/range.rs:747:5           core::ops::Bound<&T>                 fn cloned(self) -> Bound<T>;
core/src/option.rs:1453:5             core::option::Option<&T>             const fn copied(self) -> Option<T>;
core/src/panic/location.rs:85:5       core::panic::Location<'a>            const fn caller() -> &'static Location<'static>;
core/src/panic/location.rs:123:5      core::panic::Location<'a>            fn file(&self) -> &str;
core/src/panic/location.rs:145:5      core::panic::Location<'a>            fn line(&self) -> u32;
core/src/panic/location.rs:167:5      core::panic::Location<'a>            fn column(&self) -> u32;
core/src/panic/panic_info.rs:85:5     core::panic::PanicInfo<'a>           fn payload(&self) -> &(dyn Any + Send);
core/src/panic/panic_info.rs:93:5     core::panic::PanicInfo<'a>           fn message(&self) -> Option<&fmt::Arguments<'_>>;
core/src/panic/panic_info.rs:122:5    core::panic::PanicInfo<'a>           fn location(&self) -> Option<&Location<'_>>;
core/src/pin.rs:710:5                 core::pin::Pin<&'a T>                const fn get_ref(self) -> &'a T;
core/src/slice/iter.rs:1715:5         core::slice::ChunksExact<'a, T>      fn remainder(&self) -> &'a [T];
core/src/slice/iter.rs:2143:5         core::slice::ArrayChunks<'a, T, N>   fn remainder(&self) -> &'a [T];
core/src/slice/iter.rs:2717:5         core::slice::RChunksExact<'a, T>     fn remainder(&self) -> &'a [T];
core/src/str/error.rs:76:5            core::str::Utf8Error                 fn valid_up_to(&self) -> usize;
core/src/str/error.rs:97:5            core::str::Utf8Error                 fn error_len(&self) -> Option<usize>;
core/src/str/iter.rs:213:5            core::str::CharIndices<'a>           fn offset(&self) -> usize;
core/src/str/mod.rs:497:5             str                                  unsafe fn slice_unchecked(&self, begin: usize, end: usize) -> &str;
core/src/str/mod.rs:569:5             str                                  fn split_at(&self, mid: usize) -> (&str, &str);
core/src/str/mod.rs:619:5             str                                  fn split_at_mut(&mut self, mid: usize) -> (&mut str, &mut str);
core/src/str/mod.rs:760:5             str                                  fn bytes(&self) -> Bytes<'_>;
core/src/str/validations.rs:255:1     core::str                            fn utf8_char_width(b: u8) -> usize;
core/src/task/wake.rs:169:5           core::task::Context<'a>              fn waker(&self) -> &'a Waker;
core/src/task/wake.rs:244:5           core::task::Waker                    fn will_wake(&self, other: &Waker) -> bool;
core/src/time.rs:354:5                core::time::Duration                 const fn subsec_millis(&self) -> u32;
core/src/time.rs:376:5                core::time::Duration                 const fn subsec_micros(&self) -> u32;
core/src/time.rs:398:5                core::time::Duration                 const fn subsec_nanos(&self) -> u32;

Add #[must_use] to remaining alloc functions #89899

alloc/src/collections/binary_heap.rs:514:5       alloc::collections::binary_heap::BinaryHeap<T>           fn into_sorted_vec(mut self) -> Vec<T>;
alloc/src/collections/binary_heap.rs:833:5       alloc::collections::binary_heap::BinaryHeap<T>           fn iter(&self) -> Iter<'_, T>;
alloc/src/collections/binary_heap.rs:878:5       alloc::collections::binary_heap::BinaryHeap<T>           fn peek(&self) -> Option<&T>;
alloc/src/collections/binary_heap.rs:895:5       alloc::collections::binary_heap::BinaryHeap<T>           fn capacity(&self) -> usize;
alloc/src/collections/btree/map.rs:1062:5        alloc::collections::btree_map::BTreeMap<K, V>            fn range<T: ?Sized, R>(&self, range: R) -> Range<'_, K, V>;
alloc/src/collections/btree/map.rs:1106:5        alloc::collections::btree_map::BTreeMap<K, V>            fn range_mut<T: ?Sized, R>(&mut self, range: R) -> RangeMut<'_, K, V>;
alloc/src/collections/btree/map.rs:2081:5        alloc::collections::btree_map::BTreeMap<K, V>            fn iter(&self) -> Iter<'_, K, V>;
alloc/src/collections/btree/map.rs:2125:5        alloc::collections::btree_map::BTreeMap<K, V>            fn iter_mut(&mut self) -> IterMut<'_, K, V>;
alloc/src/collections/btree/map.rs:2140:5        alloc::collections::btree_map::BTreeMap<K, V>            fn keys(&self) -> Keys<'_, K, V>;
alloc/src/collections/btree/map.rs:2161:5        alloc::collections::btree_map::BTreeMap<K, V>            fn values(&self) -> Values<'_, K, V>;
alloc/src/collections/btree/map.rs:2199:5        alloc::collections::btree_map::BTreeMap<K, V>            fn values_mut(&mut self) -> ValuesMut<'_, K, V>;
alloc/src/collections/btree/map/entry.rs:351:5   alloc::collections::btree_map::OccupiedEntry<'a, K, V>   fn key(&self) -> &K;
alloc/src/collections/btree/map/entry.rs:395:5   alloc::collections::btree_map::OccupiedEntry<'a, K, V>   fn get(&self) -> &V;
alloc/src/collections/btree/set.rs:281:5         alloc::collections::btree_set::BTreeSet<T>               fn range<K: ?Sized, R>(&self, range: R) -> Range<'_, T>;
alloc/src/collections/btree/set.rs:668:5         alloc::collections::btree_set::BTreeSet<T>               fn first(&self) -> Option<&T>;
alloc/src/collections/btree/set.rs:694:5         alloc::collections::btree_set::BTreeSet<T>               fn last(&self) -> Option<&T>;
alloc/src/collections/btree/set.rs:1017:5        alloc::collections::btree_set::BTreeSet<T>               fn iter(&self) -> Iter<'_, T>;
alloc/src/collections/linked_list.rs:494:5       alloc::collections::linked_list::LinkedList<T>           fn iter(&self) -> Iter<'_, T>;
alloc/src/collections/linked_list.rs:525:5       alloc::collections::linked_list::LinkedList<T>           fn iter_mut(&mut self) -> IterMut<'_, T>;
alloc/src/collections/linked_list.rs:532:5       alloc::collections::linked_list::LinkedList<T>           fn cursor_front(&self) -> Cursor<'_, T>;
alloc/src/collections/linked_list.rs:546:5       alloc::collections::linked_list::LinkedList<T>           fn cursor_front_mut(&mut self) -> CursorMut<'_, T>;
alloc/src/collections/linked_list.rs:550:5       alloc::collections::linked_list::LinkedList<T>           fn cursor_back(&self) -> Cursor<'_, T>;
alloc/src/collections/linked_list.rs:564:5       alloc::collections::linked_list::LinkedList<T>           fn cursor_back_mut(&mut self) -> CursorMut<'_, T>;
alloc/src/collections/linked_list.rs:681:5       alloc::collections::linked_list::LinkedList<T>           fn front(&self) -> Option<&T>;
alloc/src/collections/linked_list.rs:717:5       alloc::collections::linked_list::LinkedList<T>           fn front_mut(&mut self) -> Option<&mut T>;
alloc/src/collections/linked_list.rs:731:5       alloc::collections::linked_list::LinkedList<T>           fn back(&self) -> Option<&T>;
alloc/src/collections/linked_list.rs:769:5       alloc::collections::linked_list::LinkedList<T>           fn back_mut(&mut self) -> Option<&mut T>;
alloc/src/collections/linked_list.rs:1181:5      alloc::collections::linked_list::Cursor<'a, T>           fn index(&self) -> Option<usize>;
alloc/src/collections/linked_list.rs:1235:5      alloc::collections::linked_list::Cursor<'a, T>           fn current(&self) -> Option<&'a T>;
alloc/src/collections/linked_list.rs:1245:5      alloc::collections::linked_list::Cursor<'a, T>           fn peek_next(&self) -> Option<&'a T>;
alloc/src/collections/linked_list.rs:1261:5      alloc::collections::linked_list::Cursor<'a, T>           fn peek_prev(&self) -> Option<&'a T>;
alloc/src/collections/linked_list.rs:1274:5      alloc::collections::linked_list::Cursor<'a, T>           fn front(&self) -> Option<&'a T>;
alloc/src/collections/linked_list.rs:1281:5      alloc::collections::linked_list::Cursor<'a, T>           fn back(&self) -> Option<&'a T>;
alloc/src/collections/linked_list.rs:1292:5      alloc::collections::linked_list::CursorMut<'a, T>        fn index(&self) -> Option<usize>;
alloc/src/collections/linked_list.rs:1364:5      alloc::collections::linked_list::CursorMut<'a, T>        fn current(&mut self) -> Option<&mut T>;
alloc/src/collections/linked_list.rs:1374:5      alloc::collections::linked_list::CursorMut<'a, T>        fn peek_next(&mut self) -> Option<&mut T>;
alloc/src/collections/linked_list.rs:1390:5      alloc::collections::linked_list::CursorMut<'a, T>        fn peek_prev(&mut self) -> Option<&mut T>;
alloc/src/collections/linked_list.rs:1633:5      alloc::collections::linked_list::CursorMut<'a, T>        fn front(&self) -> Option<&T>;
alloc/src/collections/linked_list.rs:1661:5      alloc::collections::linked_list::CursorMut<'a, T>        fn front_mut(&mut self) -> Option<&mut T>;
alloc/src/collections/linked_list.rs:1647:5      alloc::collections::linked_list::CursorMut<'a, T>        fn back(&self) -> Option<&T>;
alloc/src/collections/linked_list.rs:1696:5      alloc::collections::linked_list::CursorMut<'a, T>        fn back_mut(&mut self) -> Option<&mut T>;
alloc/src/collections/mod.rs:73:5                alloc::collections::TryReserveError                      fn kind(&self) -> TryReserveErrorKind;
alloc/src/fmt.rs:576:1                           alloc::fmt                                               fn format(args: Arguments<'_>) -> string::String;
alloc/src/rc.rs:2240:5                           alloc::rc::Weak<T>                                       fn strong_count(&self) -> usize;
alloc/src/rc.rs:2248:5                           alloc::rc::Weak<T>                                       fn weak_count(&self) -> usize;
alloc/src/rc.rs:2318:5                           alloc::rc::Weak<T>                                       fn ptr_eq(&self, other: &Self) -> bool;
alloc/src/str.rs:247:5                           str                                                      fn into_boxed_bytes(self: Box<str>) -> Box<[u8]>;
alloc/src/str.rs:484:5                           str                                                      fn into_string(self: Box<str>) -> String;
alloc/src/str.rs:511:5                           str                                                      fn repeat(&self, n: usize) -> String;
alloc/src/string.rs:895:5                        alloc::string::String                                    fn capacity(&self) -> usize;
alloc/src/string.rs:1815:5                       alloc::string::FromUtf8Error                             fn utf8_error(&self) -> Utf8Error;
alloc/src/sync.rs:947:5                          alloc::sync::Arc<T>                                      fn weak_count(this: &Self) -> usize;
alloc/src/sync.rs:976:5                          alloc::sync::Arc<T>                                      fn strong_count(this: &Self) -> usize;
alloc/src/sync.rs:1091:5                         alloc::sync::Arc<T>                                      fn ptr_eq(this: &Self, other: &Self) -> bool;
alloc/src/sync.rs:1893:5                         alloc::sync::Weak<T>                                     fn strong_count(&self) -> usize;
alloc/src/sync.rs:1909:5                         alloc::sync::Weak<T>                                     fn weak_count(&self) -> usize;
alloc/src/sync.rs:1988:5                         alloc::sync::Weak<T>                                     fn ptr_eq(&self, other: &Self) -> bool;
alloc/src/vec/drain.rs:63:5                      alloc::vec::Drain<'a, T, A>                              fn allocator(&self) -> &A;

Add #[must_use] to alloc functions that would leak memory #90427

alloc/src/alloc.rs:85:1    alloc                 unsafe fn alloc(layout: Layout) -> *mut u8;
alloc/src/alloc.rs:123:1   alloc                 unsafe fn realloc(ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8;
alloc/src/alloc.rs:154:1   alloc                 unsafe fn alloc_zeroed(layout: Layout) -> *mut u8;
alloc/src/sync.rs:801:5    alloc::sync::Arc<T>   fn into_raw(this: Self) -> *const T;

Add #[must_use] to remaining std functions (A-N) #90430

std/src/backtrace.rs:291:5               std::backtrace::Backtrace                                   fn capture() -> Backtrace;
std/src/backtrace.rs:309:5               std::backtrace::Backtrace                                   fn force_capture() -> Backtrace;
std/src/backtrace.rs:315:5               std::backtrace::Backtrace                                   const fn disabled() -> Backtrace;
std/src/backtrace.rs:360:5               std::backtrace::Backtrace                                   fn status() -> BacktraceStatus;
std/src/backtrace.rs:315:5               std::backtrace::Backtrace<'a>                               fn frames(&'a self) -> &'a [BacktraceFrame];
std/src/collections/hash/map.rs:1709:5   std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn key(&self) -> &K;
std/src/collections/hash/map.rs:1720:5   std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn key_mut(&mut self) -> &mut K;
std/src/collections/hash/map.rs:1731:5   std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn get(&self) -> &V;
std/src/collections/hash/map.rs:1754:5   std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn get_mut(&mut self) -> &mut V;
std/src/collections/hash/map.rs:1762:5   std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn get_key_value(&mut self) -> (&K, &V);
std/src/collections/hash/map.rs:1769:5   std::collections::hash_map::RawOccupiedEntryMut<'a, K, V>   fn get_key_value_mut(&mut self) -> (&mut K, &mut V);
std/src/env.rs:117:1                     std::env                                                    fn vars() -> Vars;
std/src/env.rs:144:1                     std::env                                                    fn vars_os() -> VarsOs;
std/src/env.rs:251:1                     std::env                                                    fn var_os<K: AsRef<OsStr>>(key: K) -> Option<OsString>;
std/src/env.rs:418:1                     std::env                                                    fn split_paths<T: AsRef<OsStr> + ?Sized>(unparsed: &T) -> SplitPaths<'_>;
std/src/env.rs:568:1                     std::env                                                    fn home_dir() -> Option<PathBuf>;
std/src/env.rs:607:1                     std::env                                                    fn temp_dir() -> PathBuf;
std/src/env.rs:747:1                     std::env                                                    fn args() -> Args;
std/src/env.rs:782:1                     std::env                                                    fn args_os() -> ArgsOs;
std/src/ffi/c_str.rs:1006:5              std::ffi::NulError                                          fn nul_position(&self) -> usize;
std/src/ffi/c_str.rs:1102:5              std::ffi::IntoStringError                                   fn utf8_error(&self) -> Utf8Error;
std/src/ffi/c_str.rs:1441:5              std::ffi::CStr                                              fn into_c_string(self: Box<CStr>) -> CString;
std/src/ffi/os_str.rs:240:5              std::ffi::OsString                                          fn capacity(&self) -> usize;
std/src/ffi/os_str.rs:700:5              std::ffi::OsStr                                             fn into_os_string(self: Box<OsStr>) -> OsString;
std/src/fs.rs:389:5                      std::fs::File                                               fn with_options() -> OpenOptions;
std/src/fs.rs:964:5                      std::fs::MetaData                                           fn file_type(&self) -> FileType;
std/src/fs.rs:1078:5                     std::fs::MetaData                                           fn permissions(&self) -> Permissions;
std/src/fs.rs:1225:5                     std::fs::Permissions                                        fn readonly(&self) -> bool;
std/src/fs.rs:1416:5                     std::fs::DirEntry                                           fn path(&self) -> PathBuf;
std/src/fs.rs:1511:5                     std::fs::DirEntry                                           fn file_name(&self) -> OsString;
std/src/io/error.rs:446:5                std::io::Error                                              fn last_os_error() -> Error;
std/src/io/error.rs:512:5                std::io::Error                                              fn raw_os_error(&self) -> Option<i32>;
std/src/io/error.rs:550:5                std::io::Error                                              fn get_ref(&self) -> Option<&(dyn error::Error + Send + Sync + 'static)>;
std/src/io/error.rs:628:5                std::io::Error                                              fn get_mut(&mut self) -> Option<&mut (dyn error::Error + Send + Sync + 'static)>;
std/src/io/error.rs:690:5                std::io::Error                                              fn kind(&self) -> ErrorKind;
std/src/io/mod.rs:1302:5                 std::io::Initializer                                        fn zeroing() -> Initializer;
std/src/io/mod.rs:1316:5                 std::io::Initializer                                        unsafe fn nop() -> Initializer;
std/src/io/mod.rs:1323:5                 std::io::Initializer                                        fn should_initialize(&self) -> bool;
std/src/io/stdio.rs:304:1                std::io                                                     fn stdin() -> Stdin;
std/src/io/stdio.rs:674:1                std::io                                                     fn stdout() -> Stdout;
std/src/io/stdio.rs:953:1                std::io                                                     fn stderr() -> Stderr;
std/src/io/util.rs:37:1                  std::io                                                     const fn empty() -> Empty;
std/src/io/util.rs:117:1                 std::io                                                     const fn repeat(byte: u8) -> Repeat;
std/src/io/util.rs:197:1                 std::io                                                     const fn sink() -> Sink;
std/src/net/addr.rs:153:5                std::net::SocketAddr                                        const fn ip(&self) -> IpAddr;
std/src/net/addr.rs:193:5                std::net::SocketAddr                                        const fn port(&self) -> u16;
std/src/net/addr.rs:298:5                std::net::SocketAddrV4                                      const fn ip(&self) -> &Ipv4Addr;
std/src/net/addr.rs:332:5                std::net::SocketAddrV4                                      const fn port(&self) -> u16;
std/src/net/addr.rs:396:5                std::net::SocketAddrV6                                      const fn ip(&self) -> &Ipv6Addr;
std/src/net/addr.rs:428:5                std::net::SocketAddrV6                                      const fn port(&self) -> u16;
std/src/net/addr.rs:470:5                std::net::SocketAddrV6                                      const fn flowinfo(&self) -> u32;
std/src/net/addr.rs:509:5                std::net::SocketAddrV6                                      const fn scope_id(&self) -> u32;
std/src/net/ip.rs:507:5                  std::net::Ipv4Addr                                          const fn octets(&self) -> [u8; 4];
std/src/net/ip.rs:1257:5                 std::net::Ipv6Addr                                          const fn segments(&self) -> [u16; 8];
std/src/net/ip.rs:1558:5                 std::net::Ipv6Addr                                          const fn multicast_scope(&self) -> Option<Ipv6MulticastScope>;
std/src/net/ip.rs:1701:5                 std::net::Ipv6Addr                                          const fn octets(&self) -> [u8; 16];
std/src/net/tcp.rs:856:5                 std::net::TcpListener                                       fn incoming(&self) -> Incoming<'_>;

Add #[must_use] to remaining std functions (O-Z) #90431

std/src/os/unix/net/ancillary.rs:204:5   std::os::unix::net::SocketCred            fn get_pid(&self) -> libc::pid_t;
std/src/os/unix/net/ancillary.rs:216:5   std::os::unix::net::SocketCred            fn get_uid(&self) -> libc::uid_t;
std/src/os/unix/net/ancillary.rs:228:5   std::os::unix::net::SocketCred            fn get_gid(&self) -> libc::gid_t;
std/src/os/unix/net/ancillary.rs:428:5   std::os::unix::net::SocketAncillary<'a>   fn capacity(&self) -> usize;
std/src/os/unix/net/ancillary.rs:446:5   std::os::unix::net::SocketAncillary<'a>   fn messages(&self) -> Messages<'_>;
std/src/os/unix/net/ancillary.rs:474:5   std::os::unix::net::SocketAncillary<'a>   fn truncated(&self) -> bool;
std/src/os/unix/net/listener.rs:236:5    std::os::unix::net::UnixListener          fn incoming(&self) -> Incoming<'_>;
std/src/os/unix/process.rs:440:1         std::os::unix::process                    fn parent_id() -> u32;
std/src/panicking.rs:164:1               std::panicking                            fn take_hook() -> Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send>;
std/src/panicking.rs:287:5               std::panicking::panic_count               fn get_count() -> usize;
std/src/panicking.rs:293:5               std::panicking::panic_count               fn count_is_zero() -> bool;
std/src/path.rs:424:5                    std::path::PrefixComponent<'a>            fn kind(&self) -> Prefix<'a>;
std/src/path.rs:1449:5                   std::path::PathBuf                        fn capacity(&self) -> usize;
std/src/path.rs:2082:5                   std::path::Path                           fn parent(&self) -> Option<&Path>;
std/src/path.rs:2123:5                   std::path::Path                           fn ancestors(&self) -> Ancestors<'_>;
std/src/path.rs:2148:5                   std::path::Path                           fn file_name(&self) -> Option<&OsStr>;
std/src/path.rs:2250:5                   std::path::Path                           fn starts_with<P: AsRef<Path>>(&self, base: P) -> bool;
std/src/path.rs:2276:5                   std::path::Path                           fn ends_with<P: AsRef<Path>>(&self, child: P) -> bool;
std/src/path.rs:2282:5                   std::path::Path                           fn file_stem(&self) -> Option<&OsStr>;
std/src/path.rs:2315:5                   std::path::Path                           fn file_prefix(&self) -> Option<&OsStr>;
std/src/path.rs:2339:5                   std::path::Path                           fn extension(&self) -> Option<&OsStr>;
std/src/path.rs:2417:5                   std::path::Path                           fn with_file_name<S: AsRef<OsStr>>(&self, file_name: S) -> PathBuf;
std/src/path.rs:2445:5                   std::path::Path                           fn with_extension<S: AsRef<OsStr>>(&self, extension: S) -> PathBuf;
std/src/path.rs:2454:5                   std::path::Path                           fn components(&self) -> Components<'_>;
std/src/path.rs:2488:5                   std::path::Path                           fn iter(&self) -> Iter<'_>;
std/src/path.rs:2638:5                   std::path::Path                           fn exists(&self) -> bool;
std/src/path.rs:2755:5                   std::path::Path                           fn into_path_buf(self: Box<Path>) -> PathBuf;
std/src/process.rs:953:5                 std::process::Command                     fn get_program(&self) -> &OsStr;
std/src/process.rs:976:5                 std::process::Command                     fn get_args(&self) -> CommandArgs<'_>;
std/src/process.rs:1008:5                std::process::Command                     fn get_envs(&self) -> CommandEnvs<'_>;
std/src/process.rs:1029:5                std::process::Command                     fn get_current_dir(&self) -> Option<&Path>;
std/src/process.rs:1191:5                std::process::Stdio                       fn piped() -> Stdio;
std/src/process.rs:1230:5                std::process::Stdio                       fn inherit() -> Stdio;
std/src/process.rs:1269:5                std::process::Stdio                       fn null() -> Stdio;
std/src/process.rs:1470:5                std::process::ExitStatus                  fn success(&self) -> bool;
std/src/process.rs:1501:5                std::process::ExitStatus                  fn code(&self) -> Option<i32>;
std/src/process.rs:1612:5                std::process::ExitStatusError             fn code_nonzero(&self) -> Option<NonZeroI32>;
std/src/process.rs:1617:5                std::process::ExitStatusError             fn into_status(&self) -> ExitStatus;
std/src/process.rs:1726:5                std::process::Child                       fn id(&self) -> u32;
std/src/process.rs:1996:1                std::process                              fn id() -> u32;
std/src/sync/condvar.rs:65:5             std::sync::WaitTimeoutResult              fn timed_out(&self) -> bool;
std/src/sync/mpsc/mod.rs:711:1           std::sync::mpsc                           fn channel<T>() -> (Sender<T>, Receiver<T>);
std/src/sync/mpsc/mod.rs:759:1           std::sync::mpsc                           fn sync_channel<T>(bound: usize) -> (SyncSender<T>, Receiver<T>);
std/src/thread/mod.rs:653:1              std::thread                               fn current() -> Thread;
std/src/thread/mod.rs:741:1              std::thread                               fn panicking() -> bool;
std/src/thread/mod.rs:1133:5             std::thread::Thread                       fn id(&self) -> ThreadId;
std/src/thread/mod.rs:1175:5             std::thread::Thread                       fn name(&self) -> Option<&str>;
std/src/thread/mod.rs:1362:5             std::thread::JoinHandle<T>                fn thread(&self) -> &Thread;
std/src/time.rs:243:5                    std::time::Instant                        fn now() -> Instant;
std/src/time.rs:296:5                    std::time::Instant                        fn duration_since(&self, earlier: Instant) -> Duration;
std/src/time.rs:316:5                    std::time::Instant                        fn checked_duration_since(&self, earlier: Instant) -> Option<Duration>;
std/src/time.rs:336:5                    std::time::Instant                        fn saturating_duration_since(&self, earlier: Instant) -> Duration;
std/src/time.rs:360:5                    std::time::Instant                        fn elapsed(&self) -> Duration;
std/src/time.rs:466:5                    std::time::SystemTime                     fn now() -> SystemTime;
std/src/time.rs:634:5                    std::time::SystemTimeError                fn duration(&self) -> Duration;

Todo

Empty

Ignored

List of modules and functions I skipped

core::array::TryFromSliceError::__description
core::char::ParseCharError::__description
core::fmt::UnsafeArg
core::fmt::Arguments::estimated_capacity
core::fmt::Arguments::new_v1
core::fmt::Arguments::new_v1_formatted
core::hash::SipHasher13
core::mem::DynMetadata<Dyn>
core::num::bignum
core::num::dec2flt
core::num::diy_float
core::num::flt2dec
core::num::fmt
core::unicode::unicode_data
std::alloc
std::os::fd
std::thread::local
stdarch

…err-locks, r=joshtriplett Add #[must_use] to stdin/stdout/stderr locks Affected methods: ```rust std::io fn stdin_locked() -> StdinLock<'static>; std::io::Stdin fn lock(&self) -> StdinLock<'_>; std::io fn stdout_locked() -> StdoutLock<'static>; std::io::Stdout fn lock(&self) -> StdoutLock<'_>; std::io fn stderr_locked() -> StderrLock<'static>; std::io::Stderr fn lock(&self) -> StderrLock<'_>; ``` Parent issue: rust-lang#89692

…s, r=joshtriplett Add #[must_use] to string/char transformation methods These methods could be misconstrued as modifying their arguments instead of returning new values. Where possible I made the note recommend a method that does mutate in place. Parent issue: rust-lang#89692

…err-locks, r=joshtriplett Add #[must_use] to stdin/stdout/stderr locks Affected methods: ```rust std::io fn stdin_locked() -> StdinLock<'static>; std::io::Stdin fn lock(&self) -> StdinLock<'_>; std::io fn stdout_locked() -> StdoutLock<'static>; std::io::Stdout fn lock(&self) -> StdoutLock<'_>; std::io fn stderr_locked() -> StderrLock<'static>; std::io::Stderr fn lock(&self) -> StderrLock<'_>; ``` Parent issue: rust-lang#89692

…s, r=joshtriplett Add #[must_use] to string/char transformation methods These methods could be misconstrued as modifying their arguments instead of returning new values. Where possible I made the note recommend a method that does mutate in place. Parent issue: rust-lang#89692

…ts, r=joshtriplett Add #[must_use] to is_condition tests There's nothing insightful to say about these so I didn't write any extra explanations. Parent issue: rust-lang#89692

…ods, r=joshtriplett Add #[must_use] to char escape methods Parent issue: rust-lang#89692

…ts, r=joshtriplett Add #[must_use] to is_condition tests There's nothing insightful to say about these so I didn't write any extra explanations. Parent issue: rust-lang#89692

…ods, r=joshtriplett Add #[must_use] to char escape methods Parent issue: rust-lang#89692

… r=joshtriplett Add #[must_use] to math and bit manipulation methods Also tidied up a few other nearby `#[must_use]`s. Parent issue: rust-lang#89692

…ts, r=joshtriplett Add #[must_use] to is_condition tests There's nothing insightful to say about these so I didn't write any extra explanations. Parent issue: rust-lang#89692

…ods, r=joshtriplett Add #[must_use] to char escape methods Parent issue: rust-lang#89692

… r=joshtriplett Add #[must_use] to math and bit manipulation methods Also tidied up a few other nearby `#[must_use]`s. Parent issue: rust-lang#89692

…ove-self, r=joshtriplett Add #[must_use] to conversions that move self Everything here got the same message. Is the wording okay? ```rust #[must_use = "`self` will be dropped if the result is not used"] ``` I want to draw attention to these methods in particular: ```rust alloc::sync::Arc<MaybeUninit<T>> unsafe fn assume_init(self) -> Arc<T>; alloc::sync::Arc<[MaybeUninit<T>]> unsafe fn assume_init(self) -> Arc<[T]>; core::pin::Pin<&'a mut T> const fn into_ref(self) -> Pin<&'a T>; core::pin::Pin<&'a mut T> const fn get_mut(self) -> &'a mut T; core::pin::Pin<&'a mut T> const unsafe fn get_unchecked_mut(self) -> &'a mut T; core::pin::Pin<&'a mut T> unsafe fn map_unchecked_mut(self, func: F) -> Pin<&'a mut U>; core::pin::Pin<&'a mut Pin<P>> fn as_deref_mut(self) -> Pin<&'a mut P::Target>; ``` Parent issue: rust-lang#89692 r? `@joshtriplett`

…rs, r=joshtriplett Add #[must_use] to alloc constructors Added `#[must_use]`. to the various forms of `new`, `pin`, and `with_capacity` in the `alloc` crate. No extra explanations given as I couldn't think of anything useful to add. I figure this deserves extra scrutiny compared to the other PRs I've done so far. In particular: * The 4 `pin`/`pin_in` methods I touched. Are there legitimate use cases for pinning and not using the result? Pinning's a difficult concept I'm not very comfortable with. * `Box`'s constructors. Do people ever create boxes just for the side effects... allocating or zeroing out memory? Parent issue: rust-lang#89692 r? `@joshtriplett`

…ctors, r=joshtriplett Add #[must_use] to core and std constructors Parent issue: rust-lang#89692 r? `@joshtriplett`

…lett add #[must_use] to functions of slice and its iterators. See rust-lang#89692.

add #[must_use] to functions of slice and its iterators. Continuation of rust-lang#92853. Tracking issue: rust-lang#89692.

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rustbot assigned jkugelman Oct 9, 2021

rustbot added A-diagnostics Area: Messages for errors, warnings, and lints C-cleanup Category: PRs that clean code up or issues documenting cleanup. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. labels Oct 9, 2021

This was referenced Oct 9, 2021

Add #[must_use] to stdin/stdout/stderr locks #89693

Merged

Add #[must_use] to string/char transformation methods #89694

Merged

This was referenced Oct 10, 2021

Add #[must_use] to is_condition tests #89718

Merged

Add #[must_use] to char escape methods #89719

Merged

Add #[must_use] to math and bit manipulation methods #89720

Merged

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Oct 10, 2021

Rollup merge of rust-lang#89719 - jkugelman:must-use-char-escape-meth…

13b1011

…ods, r=joshtriplett Add #[must_use] to char escape methods Parent issue: rust-lang#89692

This was referenced Oct 10, 2021

Add #[must_use] to alloc constructors #89726

Merged

Add #[must_use] to core and std constructors #89729

Merged

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Oct 10, 2021

Rollup merge of rust-lang#89719 - jkugelman:must-use-char-escape-meth…

98c5279

…ods, r=joshtriplett Add #[must_use] to char escape methods Parent issue: rust-lang#89692

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Oct 10, 2021

Rollup merge of rust-lang#89719 - jkugelman:must-use-char-escape-meth…

758a901

…ods, r=joshtriplett Add #[must_use] to char escape methods Parent issue: rust-lang#89692

This was referenced Oct 10, 2021

Add #[must_use] to from_value conversions #89753

Merged

Add #[must_use] to conversions that move self #89755

Merged

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Oct 11, 2021

Rollup merge of rust-lang#89729 - jkugelman:must-use-core-std-constru…

f3c613e

…ctors, r=joshtriplett Add #[must_use] to core and std constructors Parent issue: rust-lang#89692 r? `@joshtriplett`

Dylan-DPC added a commit to Dylan-DPC/rust that referenced this issue Mar 4, 2022

Rollup merge of rust-lang#92853 - jendrikw:slice-must-use, r=joshtrip…

e7b16b6

…lett add #[must_use] to functions of slice and its iterators. See rust-lang#89692.

Dylan-DPC added a commit to Dylan-DPC/rust that referenced this issue Mar 4, 2022

Rollup merge of rust-lang#92853 - jendrikw:slice-must-use, r=joshtrip…

cc25a97

…lett add #[must_use] to functions of slice and its iterators. See rust-lang#89692.

Dylan-DPC added a commit to Dylan-DPC/rust that referenced this issue Mar 4, 2022

Rollup merge of rust-lang#92853 - jendrikw:slice-must-use, r=joshtrip…

df7759d

…lett add #[must_use] to functions of slice and its iterators. See rust-lang#89692.

Dylan-DPC added a commit to Dylan-DPC/rust that referenced this issue Mar 4, 2022

Rollup merge of rust-lang#92853 - jendrikw:slice-must-use, r=joshtrip…

efcabf1

…lett add #[must_use] to functions of slice and its iterators. See rust-lang#89692.

Dylan-DPC added a commit to Dylan-DPC/rust that referenced this issue Mar 4, 2022

Rollup merge of rust-lang#92853 - jendrikw:slice-must-use, r=joshtrip…

58e9878

…lett add #[must_use] to functions of slice and its iterators. See rust-lang#89692.

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Mar 4, 2022

Rollup merge of rust-lang#92853 - jendrikw:slice-must-use, r=joshtrip…

9ff8db4

…lett add #[must_use] to functions of slice and its iterators. See rust-lang#89692.

jendrikw mentioned this issue Mar 24, 2022

add #[must_use] to functions of slice and its iterators. #95274

Merged

Dylan-DPC added a commit to Dylan-DPC/rust that referenced this issue Mar 26, 2022

Rollup merge of rust-lang#95274 - jendrikw:slice-must-use, r=Dylan-DPC

b9fcbc3

add #[must_use] to functions of slice and its iterators. Continuation of rust-lang#92853. Tracking issue: rust-lang#89692.

bors added a commit to rust-lang-ci/rust that referenced this issue Mar 26, 2022

Auto merge of rust-lang#95274 - jendrikw:slice-must-use, r=Dylan-DPC

1d9c262

add #[must_use] to functions of slice and its iterators. Continuation of rust-lang#92853. Tracking issue: rust-lang#89692.

flip1995 pushed a commit to flip1995/rust that referenced this issue Apr 7, 2022

Auto merge of rust-lang#95274 - jendrikw:slice-must-use, r=Dylan-DPC

a7da8a6

add #[must_use] to functions of slice and its iterators. Continuation of rust-lang#92853. Tracking issue: rust-lang#89692.

Bromeon mentioned this issue May 24, 2022

Add methods in Varargs to perform arguments validation and type conversion godot-rust/gdnative#892

Closed

This was referenced Jul 14, 2022

capi: Fix 'unused return value' warnings rust-lang/regex#882

Merged

Ignoring return value from Box::from_raw does not cause warning #99269

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est31 mentioned this issue May 17, 2023

Not using the result of offset_of should lint #111669

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Tracking issue for adding #[must_use] annotations throughout the standard library #89692

Tracking issue for adding #[must_use] annotations throughout the standard library #89692

jkugelman commented Oct 9, 2021 •

edited

Add #[must_use] to stdin/stdout/stderr locks #89693

Add #[must_use] to string transformation methods #89694

Add #[must_use] to is_condition checks #89718

Add #[must_use] to char escape methods #89719

Add #[must_use] to math and bit manipulation methods #89720

Add #[must_use] to alloc constructors #89726

Add #[must_use] to core and std constructors #89729

Add #[must_use] to MaybeUninit::new #89769

Add #[must_use] to from_value conversions #89753

Add #[must_use] to conversions that move self #89755

Add #[must_use] to From::from and Into::into #89770

Add #[must_use] to as_type conversions #89778

Add #[must_use] to len and is_empty #89786

Add #[must_use] to thread::Builder #89789

Add #[must_use] to to_value conversions #89794

Add #[must_use] to non-mutating verb methods #89796

Add #[must_use] to is_condition tests #89797

Add #[must_use] to Rc::downgrade #89833

Add #[must_use] to expensive computations #89835

Add #[must_use] to mem/ptr functions #89839

Add #[must_use] to remaining core functions #89897

Add #[must_use] to remaining alloc functions #89899

Add #[must_use] to alloc functions that would leak memory #90427

Add #[must_use] to remaining std functions (A-N) #90430

Add #[must_use] to remaining std functions (O-Z) #90431

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rustbot commented Oct 9, 2021

Tracking issue for adding #[must_use] annotations throughout the standard library #89692

Tracking issue for adding #[must_use] annotations throughout the standard library #89692

Comments

jkugelman commented Oct 9, 2021 • edited

Pull requests

Done

Add #[must_use] to stdin/stdout/stderr locks #89693

Add #[must_use] to string transformation methods #89694

Add #[must_use] to is_condition checks #89718

Add #[must_use] to char escape methods #89719

Add #[must_use] to math and bit manipulation methods #89720

Add #[must_use] to alloc constructors #89726

Add #[must_use] to core and std constructors #89729

Add #[must_use] to MaybeUninit::new #89769

Add #[must_use] to from_value conversions #89753

Add #[must_use] to conversions that move self #89755

Add #[must_use] to From::from and Into::into #89770

Add #[must_use] to as_type conversions #89778

Add #[must_use] to len and is_empty #89786

Add #[must_use] to thread::Builder #89789

Add #[must_use] to to_value conversions #89794

Add #[must_use] to non-mutating verb methods #89796

Add #[must_use] to is_condition tests #89797

Add #[must_use] to Rc::downgrade #89833

Add #[must_use] to expensive computations #89835

Add #[must_use] to mem/ptr functions #89839

Add #[must_use] to remaining core functions #89897

Add #[must_use] to remaining alloc functions #89899

Add #[must_use] to alloc functions that would leak memory #90427

Add #[must_use] to remaining std functions (A-N) #90430

Add #[must_use] to remaining std functions (O-Z) #90431

Todo

Ignored

Related

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rustbot commented Oct 9, 2021

jkugelman commented Oct 9, 2021 •

edited