Trait std::convert::TryFrom

pub trait TryFrom<T> {
    type Error;
    fn try_from(value: T) -> Result<Self, Self::Error>;
}

Simple and safe type conversions that may fail in a controlled way under some circumstances. It is the reciprocal of TryInto.

This is useful when you are doing a type conversion that may trivially succeed but may also need special handling. For example, there is no way to convert an i64 into an i32 using the From trait, because an i64 may contain a value that an i32 cannot represent and so the conversion would lose data. This might be handled by truncating the i64 to an i32 (essentially giving the i64's value modulo i32::MAX) or by simply returning i32::MAX, or by some other method. The From trait is intended for perfect conversions, so the TryFrom trait informs the programmer when a type conversion could go bad and lets them decide how to handle it.

Generic Implementations

• TryFrom<T> for U implies TryInto<U> for T
• try_from is reflexive, which means that TryFrom<T> for T is implemented and cannot fail -- the associated Error type for calling T::try_from() on a value of type T is Infallible. When the ! type is stabilized Infallible and ! will be equivalent.

TryFrom<T> can be implemented as follows:

use std::convert::TryFrom;

struct SuperiorThanZero(i32);

impl TryFrom<i32> for SuperiorThanZero {
    type Error = &'static str;

    fn try_from(value: i32) -> Result<Self, Self::Error> {
        if value < 0 {
            Err("SuperiorThanZero only accepts value superior than zero!")
        } else {
            Ok(SuperiorThanZero(value))
        }
    }
}

Examples

As described, i32 implements TryFrom<i64>:

use std::convert::TryFrom;

let big_number = 1_000_000_000_000i64;
// Silently truncates `big_number`, requires detecting
// and handling the truncation after the fact.
let smaller_number = big_number as i32;
assert_eq!(smaller_number, -727379968);

// Returns an error because `big_number` is too big to
// fit in an `i32`.
let try_smaller_number = i32::try_from(big_number);
assert!(try_smaller_number.is_err());

// Returns `Ok(3)`.
let try_successful_smaller_number = i32::try_from(3);
assert!(try_successful_smaller_number.is_ok());

Associated Types

type Error

The type returned in the event of a conversion error.

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Required methods

fn try_from(value: T) -> Result<Self, Self::Error>

Performs the conversion.

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Implementors

impl TryFrom<i128> for usize

type Error = TryFromIntError

fn try_from(u: i128) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for isize

type Error = TryFromIntError

fn try_from(u: i128) -> Result<isize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for i16

type Error = TryFromIntError

fn try_from(u: i128) -> Result<i16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for i32

type Error = TryFromIntError

fn try_from(u: i128) -> Result<i32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for i64

type Error = TryFromIntError

fn try_from(u: i128) -> Result<i64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for i8

type Error = TryFromIntError

fn try_from(u: i128) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for u128

type Error = TryFromIntError

fn try_from(u: i128) -> Result<u128, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for u16

type Error = TryFromIntError

fn try_from(u: i128) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for u32

type Error = TryFromIntError

fn try_from(u: i128) -> Result<u32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for u64

type Error = TryFromIntError

fn try_from(u: i128) -> Result<u64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for u8

type Error = TryFromIntError

fn try_from(u: i128) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i16> for usize

type Error = TryFromIntError

fn try_from(u: i16) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i16> for i8

type Error = TryFromIntError

fn try_from(u: i16) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i16> for u128

type Error = TryFromIntError

fn try_from(u: i16) -> Result<u128, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i16> for u16

type Error = TryFromIntError

fn try_from(u: i16) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i16> for u32

type Error = TryFromIntError

fn try_from(u: i16) -> Result<u32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i16> for u64

type Error = TryFromIntError

fn try_from(u: i16) -> Result<u64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i16> for u8

type Error = TryFromIntError

fn try_from(u: i16) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i32> for usize

type Error = TryFromIntError

fn try_from(u: i32) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i32> for isize

type Error = TryFromIntError

fn try_from(value: i32) -> Result<isize, <isize as TryFrom<i32>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i32> for i16

type Error = TryFromIntError

fn try_from(u: i32) -> Result<i16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i32> for i8

type Error = TryFromIntError

fn try_from(u: i32) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i32> for u128

type Error = TryFromIntError

fn try_from(u: i32) -> Result<u128, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i32> for u16

type Error = TryFromIntError

fn try_from(u: i32) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i32> for u32

type Error = TryFromIntError

fn try_from(u: i32) -> Result<u32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i32> for u64

type Error = TryFromIntError

fn try_from(u: i32) -> Result<u64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i32> for u8

type Error = TryFromIntError

fn try_from(u: i32) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for usize

type Error = TryFromIntError

fn try_from(u: i64) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for isize

type Error = TryFromIntError

fn try_from(value: i64) -> Result<isize, <isize as TryFrom<i64>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for i16

type Error = TryFromIntError

fn try_from(u: i64) -> Result<i16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for i32

type Error = TryFromIntError

fn try_from(u: i64) -> Result<i32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for i8

type Error = TryFromIntError

fn try_from(u: i64) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for u128

type Error = TryFromIntError

fn try_from(u: i64) -> Result<u128, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for u16

type Error = TryFromIntError

fn try_from(u: i64) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for u32

type Error = TryFromIntError

fn try_from(u: i64) -> Result<u32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for u64

type Error = TryFromIntError

fn try_from(u: i64) -> Result<u64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for u8

type Error = TryFromIntError

fn try_from(u: i64) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i8> for usize

type Error = TryFromIntError

fn try_from(u: i8) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i8> for u128

type Error = TryFromIntError

fn try_from(u: i8) -> Result<u128, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i8> for u16

type Error = TryFromIntError

fn try_from(u: i8) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i8> for u32

type Error = TryFromIntError

fn try_from(u: i8) -> Result<u32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i8> for u64

type Error = TryFromIntError

fn try_from(u: i8) -> Result<u64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i8> for u8

type Error = TryFromIntError

fn try_from(u: i8) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for i128

type Error = TryFromIntError

fn try_from(value: isize) -> Result<i128, <i128 as TryFrom<isize>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for i16

type Error = TryFromIntError

fn try_from(u: isize) -> Result<i16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for i32

type Error = TryFromIntError

fn try_from(u: isize) -> Result<i32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for i64

type Error = TryFromIntError

fn try_from(value: isize) -> Result<i64, <i64 as TryFrom<isize>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for i8

type Error = TryFromIntError

fn try_from(u: isize) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for u128

type Error = TryFromIntError

fn try_from(u: isize) -> Result<u128, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for u16

type Error = TryFromIntError

fn try_from(u: isize) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for u32

type Error = TryFromIntError

fn try_from(u: isize) -> Result<u32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for u64

type Error = TryFromIntError

fn try_from(u: isize) -> Result<u64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for u8

type Error = TryFromIntError

fn try_from(u: isize) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for usize

type Error = TryFromIntError

fn try_from(u: isize) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for isize

type Error = TryFromIntError

fn try_from(u: u128) -> Result<isize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for usize

type Error = TryFromIntError

fn try_from(u: u128) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for i128

type Error = TryFromIntError

fn try_from(u: u128) -> Result<i128, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for i16

type Error = TryFromIntError

fn try_from(u: u128) -> Result<i16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for i32

type Error = TryFromIntError

fn try_from(u: u128) -> Result<i32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for i64

type Error = TryFromIntError

fn try_from(u: u128) -> Result<i64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for i8

type Error = TryFromIntError

fn try_from(u: u128) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for u16

type Error = TryFromIntError

fn try_from(u: u128) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for u32

type Error = TryFromIntError

fn try_from(u: u128) -> Result<u32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for u64

type Error = TryFromIntError

fn try_from(u: u128) -> Result<u64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for u8

type Error = TryFromIntError

fn try_from(u: u128) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u16> for isize

type Error = TryFromIntError

fn try_from(value: u16) -> Result<isize, <isize as TryFrom<u16>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u16> for i16

type Error = TryFromIntError

fn try_from(u: u16) -> Result<i16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u16> for i8

type Error = TryFromIntError

fn try_from(u: u16) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u16> for u8

type Error = TryFromIntError

fn try_from(u: u16) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u32> for char

type Error = CharTryFromError

fn try_from(i: u32) -> Result<char, <char as TryFrom<u32>>::Error>

impl TryFrom<u32> for isize

type Error = TryFromIntError

fn try_from(value: u32) -> Result<isize, <isize as TryFrom<u32>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u32> for usize

type Error = TryFromIntError

fn try_from(value: u32) -> Result<usize, <usize as TryFrom<u32>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u32> for i16

type Error = TryFromIntError

fn try_from(u: u32) -> Result<i16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u32> for i32

type Error = TryFromIntError

fn try_from(u: u32) -> Result<i32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u32> for i8

type Error = TryFromIntError

fn try_from(u: u32) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u32> for u16

type Error = TryFromIntError

fn try_from(u: u32) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u32> for u8

type Error = TryFromIntError

fn try_from(u: u32) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for isize

type Error = TryFromIntError

fn try_from(u: u64) -> Result<isize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for usize

type Error = TryFromIntError

fn try_from(value: u64) -> Result<usize, <usize as TryFrom<u64>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for i16

type Error = TryFromIntError

fn try_from(u: u64) -> Result<i16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for i32

type Error = TryFromIntError

fn try_from(u: u64) -> Result<i32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for i64

type Error = TryFromIntError

fn try_from(u: u64) -> Result<i64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for i8

type Error = TryFromIntError

fn try_from(u: u64) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for u16

type Error = TryFromIntError

fn try_from(u: u64) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for u32

type Error = TryFromIntError

fn try_from(u: u64) -> Result<u32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for u8

type Error = TryFromIntError

fn try_from(u: u64) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u8> for i8

type Error = TryFromIntError

fn try_from(u: u8) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for i128

type Error = TryFromIntError

fn try_from(value: usize) -> Result<i128, <i128 as TryFrom<usize>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for i16

type Error = TryFromIntError

fn try_from(u: usize) -> Result<i16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for i32

type Error = TryFromIntError

fn try_from(u: usize) -> Result<i32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for i64

type Error = TryFromIntError

fn try_from(u: usize) -> Result<i64, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for i8

type Error = TryFromIntError

fn try_from(u: usize) -> Result<i8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for isize

type Error = TryFromIntError

fn try_from(u: usize) -> Result<isize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for u128

type Error = TryFromIntError

fn try_from(value: usize) -> Result<u128, <u128 as TryFrom<usize>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for u16

type Error = TryFromIntError

fn try_from(u: usize) -> Result<u16, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for u32

type Error = TryFromIntError

fn try_from(u: usize) -> Result<u32, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for u64

type Error = TryFromIntError

fn try_from(value: usize) -> Result<u64, <u64 as TryFrom<usize>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<usize> for u8

type Error = TryFromIntError

fn try_from(u: usize) -> Result<u8, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl<'_, const N: usize, T> TryFrom<&'_ [T]> for [T; N] where
    T: Copy,
    [T; N]: LengthAtMost32, 

type Error = TryFromSliceError

fn try_from(slice: &[T]) -> Result<[T; N], TryFromSliceError>

impl<'a, const N: usize, T> TryFrom<&'a [T]> for &'a [T; N] where
    [T; N]: LengthAtMost32, 

type Error = TryFromSliceError

fn try_from(slice: &[T]) -> Result<&[T; N], TryFromSliceError>

impl<'a, const N: usize, T> TryFrom<&'a mut [T]> for &'a mut [T; N] where
    [T; N]: LengthAtMost32, 

type Error = TryFromSliceError

fn try_from(slice: &mut [T]) -> Result<&mut [T; N], TryFromSliceError>

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<const N: usize, T> TryFrom<Box<[T]>> for Box<[T; N]> where
    [T; N]: LengthAtMost32, 

type Error = Box<[T]>

fn try_from(
    boxed_slice: Box<[T]>
) -> Result<Box<[T; N]>, <Box<[T; N]> as TryFrom<Box<[T]>>>::Error>

impl<const N: usize, T> TryFrom<Rc<[T]>> for Rc<[T; N]> where
    [T; N]: LengthAtMost32, 

type Error = Rc<[T]>

fn try_from(
    boxed_slice: Rc<[T]>
) -> Result<Rc<[T; N]>, <Rc<[T; N]> as TryFrom<Rc<[T]>>>::Error>

impl<const N: usize, T> TryFrom<Arc<[T]>> for Arc<[T; N]> where
    [T; N]: LengthAtMost32, 

type Error = Arc<[T]>

fn try_from(
    boxed_slice: Arc<[T]>
) -> Result<Arc<[T; N]>, <Arc<[T; N]> as TryFrom<Arc<[T]>>>::Error>

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