diff options
| -rw-r--r-- | library/core/src/iter/adapters/step_by.rs | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/library/core/src/iter/adapters/step_by.rs b/library/core/src/iter/adapters/step_by.rs index 616dd0afc51..a5cf069d407 100644 --- a/library/core/src/iter/adapters/step_by.rs +++ b/library/core/src/iter/adapters/step_by.rs @@ -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 @@ macro_rules! spec_int_ranges_r { // 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 @@ macro_rules! spec_int_ranges_r { #[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 @@ macro_rules! spec_int_ranges_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() { |