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Revert "Add implementations of last in terms of next_back on a bunch of DoubleEndedIterators."

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This reverts commit 3e86cf36b5114f201868bf459934fe346a76a2d4.
This commit is contained in:
Steven Fackler 2019-05-22 14:09:34 -07:00
parent 37ff5d388f
commit 8a22bc3b30
14 changed files with 0 additions and 159 deletions
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15
src/liballoc/collections/binary_heap.rs
View File

@ -1035,11 +1035,6 @@ impl<'a, T> Iterator for Iter<'a, T> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
#[inline]
fn last(mut self) -> Option<&'a T> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -1095,11 +1090,6 @@ impl<T> Iterator for IntoIter<T> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
#[inline]
fn last(mut self) -> Option<T> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -1146,11 +1136,6 @@ impl<T> Iterator for Drain<'_, T> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
#[inline]
fn last(mut self) -> Option<T> {
self.next_back()
}
}
#[stable(feature = "drain", since = "1.6.0")]

40
src/liballoc/collections/btree/map.rs
View File

@ -1193,11 +1193,6 @@ impl<'a, K: 'a, V: 'a> Iterator for Iter<'a, K, V> {
fn size_hint(&self) -> (usize, Option<usize>) {
(self.length, Some(self.length))
}
#[inline]
fn last(mut self) -> Option<(&'a K, &'a V)> {
self.next_back()
}
}
#[stable(feature = "fused", since = "1.26.0")]
@ -1258,11 +1253,6 @@ impl<'a, K: 'a, V: 'a> Iterator for IterMut<'a, K, V> {
fn size_hint(&self) -> (usize, Option<usize>) {
(self.length, Some(self.length))
}
#[inline]
fn last(mut self) -> Option<(&'a K, &'a mut V)> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -1369,11 +1359,6 @@ impl<K, V> Iterator for IntoIter<K, V> {
fn size_hint(&self) -> (usize, Option<usize>) {
(self.length, Some(self.length))
}
#[inline]
fn last(mut self) -> Option<(K, V)> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -1436,11 +1421,6 @@ impl<'a, K, V> Iterator for Keys<'a, K, V> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
#[inline]
fn last(mut self) -> Option<&'a K> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -1478,11 +1458,6 @@ impl<'a, K, V> Iterator for Values<'a, K, V> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
#[inline]
fn last(mut self) -> Option<&'a V> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -1520,11 +1495,6 @@ impl<'a, K, V> Iterator for Range<'a, K, V> {
unsafe { Some(self.next_unchecked()) }
}
}
#[inline]
fn last(mut self) -> Option<(&'a K, &'a V)> {
self.next_back()
}
}
#[stable(feature = "map_values_mut", since = "1.10.0")]
@ -1538,11 +1508,6 @@ impl<'a, K, V> Iterator for ValuesMut<'a, K, V> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
#[inline]
fn last(mut self) -> Option<&'a mut V> {
self.next_back()
}
}
#[stable(feature = "map_values_mut", since = "1.10.0")]
@ -1661,11 +1626,6 @@ impl<'a, K, V> Iterator for RangeMut<'a, K, V> {
unsafe { Some(self.next_unchecked()) }
}
}
#[inline]
fn last(mut self) -> Option<(&'a K, &'a mut V)> {
self.next_back()
}
}
impl<'a, K, V> RangeMut<'a, K, V> {

15
src/liballoc/collections/btree/set.rs
View File

@ -1019,11 +1019,6 @@ impl<'a, T> Iterator for Iter<'a, T> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
#[inline]
fn last(mut self) -> Option<&'a T> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a, T> DoubleEndedIterator for Iter<'a, T> {
@ -1049,11 +1044,6 @@ impl<T> Iterator for IntoIter<T> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
#[inline]
fn last(mut self) -> Option<T> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<T> DoubleEndedIterator for IntoIter<T> {
@ -1083,11 +1073,6 @@ impl<'a, T> Iterator for Range<'a, T> {
fn next(&mut self) -> Option<&'a T> {
self.iter.next().map(|(k, _)| k)
}
#[inline]
fn last(mut self) -> Option<&'a T> {
self.next_back()
}
}
#[stable(feature = "btree_range", since = "1.17.0")]

4
src/liballoc/string.rs
View File

@ -2385,10 +2385,6 @@ impl Iterator for Drain<'_> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
#[inline]
fn last(mut self) -> Option<char> {
self.next_back()
}
}
#[stable(feature = "drain", since = "1.6.0")]

14
src/liballoc/vec.rs
View File

@ -2395,11 +2395,6 @@ impl<T> Iterator for IntoIter<T> {
fn count(self) -> usize {
self.len()
}
#[inline]
fn last(mut self) -> Option<T> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -2519,11 +2514,6 @@ impl<T> Iterator for Drain<'_, T> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
#[inline]
fn last(mut self) -> Option<T> {
self.next_back()
}
}
#[stable(feature = "drain", since = "1.6.0")]
@ -2593,10 +2583,6 @@ impl<I: Iterator> Iterator for Splice<'_, I> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.drain.size_hint()
}
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "vec_splice", since = "1.21.0")]

2
src/libcore/ascii.rs
View File

@ -117,8 +117,6 @@ impl Iterator for EscapeDefault {
type Item = u8;
fn next(&mut self) -> Option<u8> { self.range.next().map(|i| self.data[i]) }
fn size_hint(&self) -> (usize, Option<usize>) { self.range.size_hint() }
#[inline]
fn last(mut self) -> Option<u8> { self.next_back() }
}
#[stable(feature = "rust1", since = "1.0.0")]
impl DoubleEndedIterator for EscapeDefault {

5
src/libcore/iter/adapters/mod.rs
View File

@ -73,11 +73,6 @@ impl<I> Iterator for Rev<I> where I: DoubleEndedIterator {
{
self.iter.position(predicate)
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]

20
src/libcore/slice/mod.rs
View File

@ -3547,11 +3547,6 @@ impl<'a, T, P> Iterator for Split<'a, T, P> where P: FnMut(&T) -> bool {
(1, Some(self.v.len() + 1))
}
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -3650,11 +3645,6 @@ impl<'a, T, P> Iterator for SplitMut<'a, T, P> where P: FnMut(&T) -> bool {
(1, Some(self.v.len() + 1))
}
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -3720,11 +3710,6 @@ impl<'a, T, P> Iterator for RSplit<'a, T, P> where P: FnMut(&T) -> bool {
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "slice_rsplit", since = "1.27.0")]
@ -3789,11 +3774,6 @@ impl<'a, T, P> Iterator for RSplitMut<'a, T, P> where P: FnMut(&T) -> bool {
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "slice_rsplit", since = "1.27.0")]

20
src/libcore/str/mod.rs
View File

@ -1333,11 +1333,6 @@ impl<'a> Iterator for Lines<'a> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.0.size_hint()
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -1384,11 +1379,6 @@ impl<'a> Iterator for LinesAny<'a> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.0.size_hint()
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -4231,11 +4221,6 @@ impl<'a> Iterator for SplitWhitespace<'a> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "split_whitespace", since = "1.1.0")]
@ -4262,11 +4247,6 @@ impl<'a> Iterator for SplitAsciiWhitespace<'a> {
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "split_ascii_whitespace", since = "1.34.0")]

6
src/libstd/env.rs
View File

@ -746,10 +746,6 @@ impl Iterator for Args {
self.inner.next().map(|s| s.into_string().unwrap())
}
fn size_hint(&self) -> (usize, Option<usize>) { self.inner.size_hint() }
#[inline]
fn last(mut self) -> Option<String> {
self.next_back()
}
}
#[stable(feature = "env", since = "1.0.0")]
@ -785,8 +781,6 @@ impl Iterator for ArgsOs {
type Item = OsString;
fn next(&mut self) -> Option<OsString> { self.inner.next() }
fn size_hint(&self) -> (usize, Option<usize>) { self.inner.size_hint() }
#[inline]
fn last(mut self) -> Option<OsString> { self.next_back() }
}
#[stable(feature = "env", since = "1.0.0")]

10
src/libstd/path.rs
View File

@ -888,11 +888,6 @@ impl<'a> Iterator for Iter<'a> {
fn next(&mut self) -> Option<&'a OsStr> {
self.inner.next().map(Component::as_os_str)
}
#[inline]
fn last(mut self) -> Option<&'a OsStr> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]
@ -956,11 +951,6 @@ impl<'a> Iterator for Components<'a> {
}
None
}
#[inline]
fn last(mut self) -> Option<Self::Item> {
self.next_back()
}
}
#[stable(feature = "rust1", since = "1.0.0")]

2
src/libstd/sys/unix/args.rs
View File

@ -35,8 +35,6 @@ impl Iterator for Args {
type Item = OsString;
fn next(&mut self) -> Option<OsString> { self.iter.next() }
fn size_hint(&self) -> (usize, Option<usize>) { self.iter.size_hint() }
#[inline]
fn last(mut self) -> Option<OsString> { self.next_back() }
}
impl ExactSizeIterator for Args {

4
src/libstd/sys/wasm/args.rs
View File

@ -37,10 +37,6 @@ impl Iterator for Args {
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
#[inline]
fn last(mut self) -> Option<OsString> {
self.next_back()
}
}
impl ExactSizeIterator for Args {

2
src/libstd/sys/windows/args.rs
View File

@ -181,8 +181,6 @@ impl Iterator for Args {
type Item = OsString;
fn next(&mut self) -> Option<OsString> { self.parsed_args_list.next() }
fn size_hint(&self) -> (usize, Option<usize>) { self.parsed_args_list.size_hint() }
#[inline]
fn last(mut self) -> Option<OsString> { self.next_back() }
}
impl DoubleEndedIterator for Args {