Make more From impls const (libcore)
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Make more `From` impls `const` (libcore) Adding `const` to `From` implementations in the core. `rustc_const_unstable` attribute is not added to unstable implementations. Tracking issue: rust-lang#88674 <details> <summary>Done</summary><div> - `T` from `T` - `T` from `!` - `Option<T>` from `T` - `Option<&T>` from `&Option<T>` - `Option<&mut T>` from `&mut Option<T>` - `Cell<T>` from `T` - `RefCell<T>` from `T` - `UnsafeCell<T>` from `T` - `OnceCell<T>` from `T` - `Poll<T>` from `T` - `u32` from `char` - `u64` from `char` - `u128` from `char` - `char` from `u8` - `AtomicBool` from `bool` - `AtomicPtr<T>` from `*mut T` - `AtomicI(bits)` from `i(bits)` - `AtomicU(bits)` from `u(bits)` - `i(bits)` from `NonZeroI(bits)` - `u(bits)` from `NonZeroU(bits)` - `NonNull<T>` from `Unique<T>` - `NonNull<T>` from `&T` - `NonNull<T>` from `&mut T` - `Unique<T>` from `&mut T` - `Infallible` from `!` - `TryIntError` from `!` - `TryIntError` from `Infallible` - `TryFromSliceError` from `Infallible` - `FromResidual for Option<T>` </div></details> <details> <summary>Remaining</summary><dev> - `NonZero` from `NonZero` These can't be made const at this time because these use Into::into. https://github.com/rust-lang/rust/blob/master/library/core/src/convert/num.rs#L393 - `std`, `alloc` There may still be many implementations that can be made `const`. </div></details>
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Rollup of 10 pull requests Successful merges: - rust-lang#86479 (Automatic exponential formatting in Debug) - rust-lang#87404 (Add support for artifact size profiling) - rust-lang#87769 (Alloc features cleanup) - rust-lang#88789 (remove unnecessary bound on Zip specialization impl) - rust-lang#88860 (Deduplicate panic_fmt) - rust-lang#90009 (Make more `From` impls `const` (libcore)) - rust-lang#90018 (Fix rustdoc UI for very long type names) - rust-lang#90025 (Revert rust-lang#86011 to fix an incorrect bound check) - rust-lang#90036 (Remove border-bottom from most docblocks.) - rust-lang#90060 (Update RELEASES.md) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Adding
consttoFromimplementations in the core.rustc_const_unstableattribute is not added to unstable implementations.Tracking issue: #88674
Done
TfromTTfrom!Option<T>fromTOption<&T>from&Option<T>Option<&mut T>from&mut Option<T>Cell<T>fromTRefCell<T>fromTUnsafeCell<T>fromTOnceCell<T>fromTPoll<T>fromTu32fromcharu64fromcharu128fromcharcharfromu8AtomicBoolfromboolAtomicPtr<T>from*mut TAtomicI(bits)fromi(bits)AtomicU(bits)fromu(bits)i(bits)fromNonZeroI(bits)u(bits)fromNonZeroU(bits)NonNull<T>fromUnique<T>NonNull<T>from&TNonNull<T>from&mut TUnique<T>from&mut TInfalliblefrom!TryIntErrorfrom!TryIntErrorfromInfallibleTryFromSliceErrorfromInfallibleFromResidual for Option<T>Remaining
NonZerofromNonZeroThese can't be made const at this time because these use Into::into.
https://github.com/rust-lang/rust/blob/master/library/core/src/convert/num.rs#L393
std,allocThere may still be many implementations that can be made
const.