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Use metavar ${count(x)} instead of reimplementing it

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This commit is contained in:
Maybe Waffle 2022-06-02 12:26:06 +04:00
parent 9fba2622a0
commit 4d04a062c8
1 changed files with 3 additions and 9 deletions
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12
library/core/src/tuple.rs
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@ -102,17 +102,17 @@ macro_rules! tuple_impls {
}
#[stable(feature = "array_tuple_conv", since = "1.63.0")]
impl<T> From<[T; count!($($T)+)]> for ($(${ignore(T)} T,)+) {
impl<T> From<[T; ${count(T)}]> for ($(${ignore(T)} T,)+) {
#[inline]
#[allow(non_snake_case)]
fn from(array: [T; count!($($T)+)]) -> Self {
fn from(array: [T; ${count(T)}]) -> Self {
let [$($T,)+] = array;
($($T,)+)
}
}
#[stable(feature = "array_tuple_conv", since = "1.63.0")]
impl<T> From<($(${ignore(T)} T,)+)> for [T; count!($($T)+)] {
impl<T> From<($(${ignore(T)} T,)+)> for [T; ${count(T)}] {
#[inline]
#[allow(non_snake_case)]
fn from(tuple: ($(${ignore(T)} T,)+)) -> Self {
@ -200,12 +200,6 @@ macro_rules! last_type {
tuple_impls!(E D C B A Z Y X W V U T);
macro_rules! count {
($($a:ident)*) => {
0 $(${ignore(a)} + 1)*
};
}
#[stable(feature = "array_tuple_conv", since = "1.63.0")]
impl<T> From<()> for [T; 0] {
fn from((): ()) -> Self {