Use const generics for array impls, restricted to 0..=32
- uses a never-stable core::array::LengthAtMost32 to bound the impls - includes a custom error message to avoid mentioning LengthAtMost32 too often - doesn't use macros for the slice implementations to avoid #62433
This commit is contained in:
Scott McMurray
parent
481068a707
commit
d6a9793722
|
|
@ -81,6 +81,7 @@ impl From<Infallible> for TryFromSliceError {
|
|||
}
|
||||
}
|
||||
|
||||
#[cfg(bootstrap)]
|
||||
macro_rules! __impl_slice_eq1 {
|
||||
($Lhs: ty, $Rhs: ty) => {
|
||||
__impl_slice_eq1! { $Lhs, $Rhs, Sized }
|
||||
|
|
@ -96,6 +97,7 @@ macro_rules! __impl_slice_eq1 {
|
|||
}
|
||||
}
|
||||
|
||||
#[cfg(bootstrap)]
|
||||
macro_rules! __impl_slice_eq2 {
|
||||
($Lhs: ty, $Rhs: ty) => {
|
||||
__impl_slice_eq2! { $Lhs, $Rhs, Sized }
|
||||
|
|
@ -114,6 +116,7 @@ macro_rules! __impl_slice_eq2 {
|
|||
}
|
||||
|
||||
// macro for implementing n-element array functions and operations
|
||||
#[cfg(bootstrap)]
|
||||
macro_rules! array_impls {
|
||||
($($N:expr)+) => {
|
||||
$(
|
||||
|
|
@ -264,6 +267,323 @@ macro_rules! array_impls {
|
|||
}
|
||||
}
|
||||
|
||||
#[cfg(not(bootstrap))]
|
||||
mod impls_using_const_generics {
|
||||
use super::*;
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T, const N: usize> AsRef<[T]> for [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn as_ref(&self) -> &[T] {
|
||||
&self[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T, const N: usize> AsMut<[T]> for [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn as_mut(&mut self) -> &mut [T] {
|
||||
&mut self[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "array_borrow", since = "1.4.0")]
|
||||
impl<T, const N: usize> Borrow<[T]> for [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
fn borrow(&self) -> &[T] {
|
||||
self
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "array_borrow", since = "1.4.0")]
|
||||
impl<T, const N: usize> BorrowMut<[T]> for [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
fn borrow_mut(&mut self) -> &mut [T] {
|
||||
self
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "try_from", since = "1.34.0")]
|
||||
impl<T, const N: usize> TryFrom<&[T]> for [T; N]
|
||||
where
|
||||
T: Copy,
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
type Error = TryFromSliceError;
|
||||
|
||||
fn try_from(slice: &[T]) -> Result<[T; N], TryFromSliceError> {
|
||||
<&Self>::try_from(slice).map(|r| *r)
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "try_from", since = "1.34.0")]
|
||||
impl<'a, T, const N: usize> TryFrom<&'a [T]> for &'a [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
type Error = TryFromSliceError;
|
||||
|
||||
fn try_from(slice: &[T]) -> Result<&[T; N], TryFromSliceError> {
|
||||
if slice.len() == N {
|
||||
let ptr = slice.as_ptr() as *const [T; N];
|
||||
unsafe { Ok(&*ptr) }
|
||||
} else {
|
||||
Err(TryFromSliceError(()))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "try_from", since = "1.34.0")]
|
||||
impl<'a, T, const N: usize> 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> {
|
||||
if slice.len() == N {
|
||||
let ptr = slice.as_mut_ptr() as *mut [T; N];
|
||||
unsafe { Ok(&mut *ptr) }
|
||||
} else {
|
||||
Err(TryFromSliceError(()))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: Hash, const N: usize> Hash for [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
fn hash<H: hash::Hasher>(&self, state: &mut H) {
|
||||
Hash::hash(&self[..], state)
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: fmt::Debug, const N: usize> fmt::Debug for [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
fmt::Debug::fmt(&&self[..], f)
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, T, const N: usize> IntoIterator for &'a [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
type Item = &'a T;
|
||||
type IntoIter = Iter<'a, T>;
|
||||
|
||||
fn into_iter(self) -> Iter<'a, T> {
|
||||
self.iter()
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, T, const N: usize> IntoIterator for &'a mut [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
type Item = &'a mut T;
|
||||
type IntoIter = IterMut<'a, T>;
|
||||
|
||||
fn into_iter(self) -> IterMut<'a, T> {
|
||||
self.iter_mut()
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, 'b, A, B, const N: usize> PartialEq<[B; N]> for [A; N]
|
||||
where
|
||||
A: PartialEq<B>,
|
||||
[A; N]: LengthAtMost32,
|
||||
[B; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[B; N]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[B; N]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, 'b, A, B, const N: usize> PartialEq<[B]> for [A; N]
|
||||
where
|
||||
A: PartialEq<B>,
|
||||
[A; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[B]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[B]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, 'b, A, B, const N: usize> PartialEq<[A; N]> for [B]
|
||||
where
|
||||
B: PartialEq<A>,
|
||||
[A; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[A; N]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[A; N]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, 'b, A, B, const N: usize> PartialEq<&'b [B]> for [A; N]
|
||||
where
|
||||
A: PartialEq<B>,
|
||||
[A; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &&'b [B]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &&'b [B]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, 'b, A, B, const N: usize> PartialEq<[A; N]> for &'b [B]
|
||||
where
|
||||
B: PartialEq<A>,
|
||||
[A; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[A; N]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[A; N]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, 'b, A, B, const N: usize> PartialEq<&'b mut [B]> for [A; N]
|
||||
where
|
||||
A: PartialEq<B>,
|
||||
[A; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &&'b mut [B]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &&'b mut [B]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, 'b, A, B, const N: usize> PartialEq<[A; N]> for &'b mut [B]
|
||||
where
|
||||
B: PartialEq<A>,
|
||||
[A; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[A; N]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[A; N]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
// NOTE: some less important impls are omitted to reduce code bloat
|
||||
// __impl_slice_eq2! { [A; $N], &'b [B; $N] }
|
||||
// __impl_slice_eq2! { [A; $N], &'b mut [B; $N] }
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: Eq, const N: usize> Eq for [T; N] where [T; N]: LengthAtMost32 {}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: PartialOrd, const N: usize> PartialOrd for [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn partial_cmp(&self, other: &[T; N]) -> Option<Ordering> {
|
||||
PartialOrd::partial_cmp(&&self[..], &&other[..])
|
||||
}
|
||||
#[inline]
|
||||
fn lt(&self, other: &[T; N]) -> bool {
|
||||
PartialOrd::lt(&&self[..], &&other[..])
|
||||
}
|
||||
#[inline]
|
||||
fn le(&self, other: &[T; N]) -> bool {
|
||||
PartialOrd::le(&&self[..], &&other[..])
|
||||
}
|
||||
#[inline]
|
||||
fn ge(&self, other: &[T; N]) -> bool {
|
||||
PartialOrd::ge(&&self[..], &&other[..])
|
||||
}
|
||||
#[inline]
|
||||
fn gt(&self, other: &[T; N]) -> bool {
|
||||
PartialOrd::gt(&&self[..], &&other[..])
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: Ord, const N: usize> Ord for [T; N]
|
||||
where
|
||||
[T; N]: LengthAtMost32,
|
||||
{
|
||||
#[inline]
|
||||
fn cmp(&self, other: &[T; N]) -> Ordering {
|
||||
Ord::cmp(&&self[..], &&other[..])
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Implemented for lengths where trait impls are allowed on arrays in core/std
|
||||
#[rustc_on_unimplemented(
|
||||
message="arrays only have std trait implementations for lengths 0..=32",
|
||||
)]
|
||||
#[unstable(feature = "const_generic_impls_guard", issue = "0",
|
||||
reason = "will never be stable, just a temporary step until const generics are stable")]
|
||||
#[cfg(not(bootstrap))]
|
||||
pub trait LengthAtMost32 {}
|
||||
|
||||
#[cfg(not(bootstrap))]
|
||||
macro_rules! array_impls {
|
||||
($($N:literal)+) => {
|
||||
$(
|
||||
#[unstable(feature = "const_generic_impls_guard", issue = "0")]
|
||||
impl<T> LengthAtMost32 for [T; $N] {}
|
||||
)+
|
||||
}
|
||||
}
|
||||
|
||||
array_impls! {
|
||||
0 1 2 3 4 5 6 7 8 9
|
||||
10 11 12 13 14 15 16 17 18 19
|
||||
|
|
|
|||
|
|
@ -74,6 +74,7 @@
|
|||
#![feature(concat_idents)]
|
||||
#![feature(const_fn)]
|
||||
#![feature(const_fn_union)]
|
||||
#![cfg_attr(not(bootstrap), feature(const_generics))]
|
||||
#![feature(custom_inner_attributes)]
|
||||
#![feature(doc_cfg)]
|
||||
#![feature(doc_spotlight)]
|
||||
|
|
|
|||
|
|
@ -0,0 +1,66 @@
|
|||
// check-pass
|
||||
|
||||
pub fn yes_as_ref() -> impl AsRef<[u8]> {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_as_mut() -> impl AsMut<[u8]> {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_borrow() -> impl std::borrow::Borrow<[u8]> {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_borrow_mut() -> impl std::borrow::BorrowMut<[u8]> {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_try_from_slice() -> impl std::convert::TryFrom<&'static [u8]> {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_ref_try_from_slice() -> impl std::convert::TryFrom<&'static [u8]> {
|
||||
let a: &'static _ = &[0; 32];
|
||||
a
|
||||
}
|
||||
|
||||
pub fn yes_hash() -> impl std::hash::Hash {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_debug() -> impl std::fmt::Debug {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_ref_into_iterator() -> impl IntoIterator<Item=&'static u8> {
|
||||
let a: &'static _ = &[0; 32];
|
||||
a
|
||||
}
|
||||
|
||||
pub fn yes_partial_eq() -> impl PartialEq<[u8; 32]> {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_partial_eq_slice() -> impl PartialEq<[u8]> {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_slice_partial_eq() -> impl PartialEq<[u8; 32]> {
|
||||
let a: &'static _ = &[0; 32];
|
||||
&a[..]
|
||||
}
|
||||
|
||||
pub fn yes_eq() -> impl Eq {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_partial_ord() -> impl PartialOrd<[u8; 32]> {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
pub fn yes_ord() -> impl Ord {
|
||||
[0; 32]
|
||||
}
|
||||
|
||||
fn main() {}
|
||||
|
|
@ -0,0 +1,29 @@
|
|||
pub fn no_debug() {
|
||||
println!("{:?}", [0_usize; 33]);
|
||||
//~^ ERROR arrays only have std trait implementations for lengths 0..=32
|
||||
}
|
||||
|
||||
pub fn no_hash() {
|
||||
use std::collections::HashSet;
|
||||
let mut set = HashSet::new();
|
||||
set.insert([0_usize; 33]);
|
||||
//~^ ERROR arrays only have std trait implementations for lengths 0..=32
|
||||
}
|
||||
|
||||
pub fn no_partial_eq() -> bool {
|
||||
[0_usize; 33] == [1_usize; 33]
|
||||
//~^ ERROR binary operation `==` cannot be applied to type `[usize; 33]`
|
||||
}
|
||||
|
||||
pub fn no_partial_ord() -> bool {
|
||||
[0_usize; 33] < [1_usize; 33]
|
||||
//~^ ERROR binary operation `<` cannot be applied to type `[usize; 33]`
|
||||
}
|
||||
|
||||
pub fn no_into_iterator() {
|
||||
for _ in &[0_usize; 33] {
|
||||
//~^ ERROR the trait bound `&[usize; 33]: std::iter::IntoIterator` is not satisfied
|
||||
}
|
||||
}
|
||||
|
||||
fn main() {}
|
||||
|
|
@ -0,0 +1,54 @@
|
|||
error[E0277]: arrays only have std trait implementations for lengths 0..=32
|
||||
--> $DIR/core-traits-no-impls-length-33.rs:2:22
|
||||
|
|
||||
LL | println!("{:?}", [0_usize; 33]);
|
||||
| ^^^^^^^^^^^^^ the trait `std::array::LengthAtMost32` is not implemented for `[usize; 33]`
|
||||
|
|
||||
= note: required because of the requirements on the impl of `std::fmt::Debug` for `[usize; 33]`
|
||||
= note: required by `std::fmt::Debug::fmt`
|
||||
|
||||
error[E0277]: arrays only have std trait implementations for lengths 0..=32
|
||||
--> $DIR/core-traits-no-impls-length-33.rs:9:9
|
||||
|
|
||||
LL | set.insert([0_usize; 33]);
|
||||
| ^^^^^^ the trait `std::array::LengthAtMost32` is not implemented for `[usize; 33]`
|
||||
|
|
||||
= note: required because of the requirements on the impl of `std::cmp::Eq` for `[usize; 33]`
|
||||
|
||||
error[E0369]: binary operation `==` cannot be applied to type `[usize; 33]`
|
||||
--> $DIR/core-traits-no-impls-length-33.rs:14:19
|
||||
|
|
||||
LL | [0_usize; 33] == [1_usize; 33]
|
||||
| ------------- ^^ ------------- [usize; 33]
|
||||
| |
|
||||
| [usize; 33]
|
||||
|
|
||||
= note: an implementation of `std::cmp::PartialEq` might be missing for `[usize; 33]`
|
||||
|
||||
error[E0369]: binary operation `<` cannot be applied to type `[usize; 33]`
|
||||
--> $DIR/core-traits-no-impls-length-33.rs:19:19
|
||||
|
|
||||
LL | [0_usize; 33] < [1_usize; 33]
|
||||
| ------------- ^ ------------- [usize; 33]
|
||||
| |
|
||||
| [usize; 33]
|
||||
|
|
||||
= note: an implementation of `std::cmp::PartialOrd` might be missing for `[usize; 33]`
|
||||
|
||||
error[E0277]: the trait bound `&[usize; 33]: std::iter::IntoIterator` is not satisfied
|
||||
--> $DIR/core-traits-no-impls-length-33.rs:24:14
|
||||
|
|
||||
LL | for _ in &[0_usize; 33] {
|
||||
| ^^^^^^^^^^^^^^ the trait `std::iter::IntoIterator` is not implemented for `&[usize; 33]`
|
||||
|
|
||||
= help: the following implementations were found:
|
||||
<&'a [T; _] as std::iter::IntoIterator>
|
||||
<&'a [T] as std::iter::IntoIterator>
|
||||
<&'a mut [T; _] as std::iter::IntoIterator>
|
||||
<&'a mut [T] as std::iter::IntoIterator>
|
||||
= note: required by `std::iter::IntoIterator::into_iter`
|
||||
|
||||
error: aborting due to 5 previous errors
|
||||
|
||||
Some errors have detailed explanations: E0277, E0369.
|
||||
For more information about an error, try `rustc --explain E0277`.
|
||||
|
|
@ -4,6 +4,7 @@
|
|||
use std::fmt::Debug;
|
||||
|
||||
#[derive(Debug)]
|
||||
struct S<T: Debug, const N: usize>([T; N]); //~ ERROR `[T; _]` doesn't implement `std::fmt::Debug`
|
||||
struct S<T: Debug, const N: usize>([T; N]);
|
||||
//~^ ERROR arrays only have std trait implementations for lengths 0..=32
|
||||
|
||||
fn main() {}
|
||||
|
|
|
|||
|
|
@ -4,13 +4,13 @@ warning: the feature `const_generics` is incomplete and may cause the compiler t
|
|||
LL | #![feature(const_generics)]
|
||||
| ^^^^^^^^^^^^^^
|
||||
|
||||
error[E0277]: `[T; _]` doesn't implement `std::fmt::Debug`
|
||||
error[E0277]: arrays only have std trait implementations for lengths 0..=32
|
||||
--> $DIR/broken-mir-2.rs:7:36
|
||||
|
|
||||
LL | struct S<T: Debug, const N: usize>([T; N]);
|
||||
| ^^^^^^ `[T; _]` cannot be formatted using `{:?}` because it doesn't implement `std::fmt::Debug`
|
||||
| ^^^^^^ the trait `std::array::LengthAtMost32` is not implemented for `[T; _]`
|
||||
|
|
||||
= help: the trait `std::fmt::Debug` is not implemented for `[T; _]`
|
||||
= note: required because of the requirements on the impl of `std::fmt::Debug` for `[T; _]`
|
||||
= note: required because of the requirements on the impl of `std::fmt::Debug` for `&[T; _]`
|
||||
= note: required for the cast to the object type `dyn std::fmt::Debug`
|
||||
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
|
||||
#[derive(Debug)]
|
||||
struct X<const N: usize> {
|
||||
a: [u32; N], //~ ERROR `[u32; _]` doesn't implement `std::fmt::Debug`
|
||||
a: [u32; N], //~ ERROR arrays only have std trait implementations for lengths 0..=32
|
||||
}
|
||||
|
||||
fn main() {}
|
||||
|
|
|
|||
|
|
@ -4,13 +4,13 @@ warning: the feature `const_generics` is incomplete and may cause the compiler t
|
|||
LL | #![feature(const_generics)]
|
||||
| ^^^^^^^^^^^^^^
|
||||
|
||||
error[E0277]: `[u32; _]` doesn't implement `std::fmt::Debug`
|
||||
error[E0277]: arrays only have std trait implementations for lengths 0..=32
|
||||
--> $DIR/derive-debug-array-wrapper.rs:6:5
|
||||
|
|
||||
LL | a: [u32; N],
|
||||
| ^^^^^^^^^^^ `[u32; _]` cannot be formatted using `{:?}` because it doesn't implement `std::fmt::Debug`
|
||||
| ^^^^^^^^^^^ the trait `std::array::LengthAtMost32` is not implemented for `[u32; _]`
|
||||
|
|
||||
= help: the trait `std::fmt::Debug` is not implemented for `[u32; _]`
|
||||
= note: required because of the requirements on the impl of `std::fmt::Debug` for `[u32; _]`
|
||||
= note: required because of the requirements on the impl of `std::fmt::Debug` for `&[u32; _]`
|
||||
= note: required for the cast to the object type `dyn std::fmt::Debug`
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue