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BTree: remove outdated traces of coercions #81956

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Feb 14, 2021
Merged

BTree: remove outdated traces of coercions #81956

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26 changes: 7 additions & 19 deletions library/alloc/src/collections/btree/map.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1271,7 +1271,7 @@ impl<'a, K: 'a, V: 'a> Iterator for Iter<'a, K, V> {
None
} else {
self.length -= 1;
unsafe { Some(self.range.next_unchecked()) }
Some(unsafe { self.range.next_unchecked() })
}
}

Expand Down Expand Up @@ -1302,7 +1302,7 @@ impl<'a, K: 'a, V: 'a> DoubleEndedIterator for Iter<'a, K, V> {
None
} else {
self.length -= 1;
unsafe { Some(self.range.next_back_unchecked()) }
Some(unsafe { self.range.next_back_unchecked() })
}
}
}
Expand Down Expand Up @@ -1340,8 +1340,7 @@ impl<'a, K: 'a, V: 'a> Iterator for IterMut<'a, K, V> {
None
} else {
self.length -= 1;
let (k, v) = unsafe { self.range.next_unchecked() };
Some((k, v)) // coerce k from `&mut K` to `&K`
Some(unsafe { self.range.next_unchecked() })
}
}

Expand Down Expand Up @@ -1369,8 +1368,7 @@ impl<'a, K: 'a, V: 'a> DoubleEndedIterator for IterMut<'a, K, V> {
None
} else {
self.length -= 1;
let (k, v) = unsafe { self.range.next_back_unchecked() };
Some((k, v)) // coerce k from `&mut K` to `&K`
Some(unsafe { self.range.next_back_unchecked() })
}
}
}
Expand Down Expand Up @@ -1692,7 +1690,7 @@ impl<'a, K, V> Iterator for Range<'a, K, V> {
type Item = (&'a K, &'a V);

fn next(&mut self) -> Option<(&'a K, &'a V)> {
if self.is_empty() { None } else { unsafe { Some(self.next_unchecked()) } }
if self.is_empty() { None } else { Some(unsafe { self.next_unchecked() }) }
}

fn last(mut self) -> Option<(&'a K, &'a V)> {
Expand Down Expand Up @@ -1856,12 +1854,7 @@ impl<'a, K, V> Iterator for RangeMut<'a, K, V> {
type Item = (&'a K, &'a mut V);

fn next(&mut self) -> Option<(&'a K, &'a mut V)> {
if self.is_empty() {
None
} else {
let (k, v) = unsafe { self.next_unchecked() };
Some((k, v)) // coerce k from `&mut K` to `&K`
}
if self.is_empty() { None } else { Some(unsafe { self.next_unchecked() }) }
}

fn last(mut self) -> Option<(&'a K, &'a mut V)> {
Expand Down Expand Up @@ -1899,12 +1892,7 @@ impl<'a, K, V> RangeMut<'a, K, V> {
#[stable(feature = "btree_range", since = "1.17.0")]
impl<'a, K, V> DoubleEndedIterator for RangeMut<'a, K, V> {
fn next_back(&mut self) -> Option<(&'a K, &'a mut V)> {
if self.is_empty() {
None
} else {
let (k, v) = unsafe { self.next_back_unchecked() };
Some((k, v)) // coerce k from `&mut K` to `&K`
}
if self.is_empty() { None } else { Some(unsafe { self.next_back_unchecked() }) }
}
}

Expand Down