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Rollup merge of #124380 - lcnr:std-unnecessary-params, r=Nilstrieb

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`Range` iteration specialization: remove trivial bounds

These bounds on impl items are trivially true and never checked by a caller. They end up shadowing the actual impls, currently preventing normalization in the new solver. While we may have to fix the underlying issue in the new solver at some point, for now this is an easy way to get us closer to compiling core with `-Znext-solver`.

r? `@Nilstrieb`
This commit is contained in:
Matthias Krüger 2024-04-25 21:12:18 +02:00 committed by GitHub
parent 6c21abf291 ce70584753
commit 3c0c5b4e46
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GPG key ID: B5690EEEBB952194
1 changed files with 7 additions and 13 deletions
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20
library/core/src/iter/adapters/step_by.rs
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@ -515,9 +515,7 @@ macro_rules! spec_int_ranges_r {
unsafe impl StepByBackImpl<Range<$t>> for StepBy<Range<$t>> {
#[inline]
fn spec_next_back(&mut self) -> Option<Self::Item>
where Range<$t>: DoubleEndedIterator + ExactSizeIterator,
{
fn spec_next_back(&mut self) -> Option<Self::Item> {
let step = self.original_step().get() as $t;
let remaining = self.iter.end;
if remaining > 0 {
@ -533,9 +531,7 @@ fn spec_next_back(&mut self) -> Option<Self::Item>
// We have to repeat them here so that the specialization overrides the StepByImplBack defaults
#[inline]
fn spec_nth_back(&mut self, n: usize) -> Option<Self::Item>
where Self: DoubleEndedIterator,
{
fn spec_nth_back(&mut self, n: usize) -> Option<Self::Item> {
if self.advance_back_by(n).is_err() {
return None;
}
@ -544,10 +540,9 @@ fn spec_nth_back(&mut self, n: usize) -> Option<Self::Item>
#[inline]
fn spec_try_rfold<Acc, F, R>(&mut self, init: Acc, mut f: F) -> R
where
Self: DoubleEndedIterator,
F: FnMut(Acc, Self::Item) -> R,
R: Try<Output = Acc>
where
F: FnMut(Acc, Self::Item) -> R,
R: Try<Output = Acc>
{
let mut accum = init;
while let Some(x) = self.next_back() {
@ -558,9 +553,8 @@ fn spec_try_rfold<Acc, F, R>(&mut self, init: Acc, mut f: F) -> R
#[inline]
fn spec_rfold<Acc, F>(mut self, init: Acc, mut f: F) -> Acc
where
Self: DoubleEndedIterator,
F: FnMut(Acc, Self::Item) -> Acc
where
F: FnMut(Acc, Self::Item) -> Acc
{
let mut accum = init;
while let Some(x) = self.next_back() {