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Commit2206c6b

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Rollup merge ofrust-lang#127189 - GrigorenkoPV:linkedlist-cursor-list, r=Nilstrieb
LinkedList's Cursor: method to get a ref to the cursor's listWe're already providing `.back()` & `.front()`, for which we hold onto a reference to the parent list, so why not share it? Useful for when you got `LinkedList` -> `CursorMut` -> `Cursor` and cannot take another ref to the list, even though you should be able to. This seems to be completely safe & sound.The name is, of course, bikesheddable.
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‎alloc/src/collections/linked_list.rs‎

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@@ -1495,6 +1495,14 @@ impl<'a, T, A: Allocator> Cursor<'a, T, A> {
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pubfnback(&self) ->Option<&'aT>{
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self.list.back()
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}
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/// Provides a reference to the cursor's parent list.
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#[must_use]
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#[inline(always)]
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#[unstable(feature ="linked_list_cursors", issue ="58533")]
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pubfnas_list(&self) ->&'aLinkedList<T,A>{
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self.list
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}
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}
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impl<'a,T,A:Allocator>CursorMut<'a,T,A>{
@@ -1605,6 +1613,18 @@ impl<'a, T, A: Allocator> CursorMut<'a, T, A> {
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pubfnas_cursor(&self) ->Cursor<'_,T,A>{
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Cursor{list:self.list,current:self.current,index:self.index}
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}
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/// Provides a read-only reference to the cursor's parent list.
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///
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/// The lifetime of the returned reference is bound to that of the
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/// `CursorMut`, which means it cannot outlive the `CursorMut` and that the
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/// `CursorMut` is frozen for the lifetime of the reference.
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#[must_use]
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#[inline(always)]
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#[unstable(feature ="linked_list_cursors", issue ="58533")]
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pubfnas_list(&self) ->&LinkedList<T,A>{
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self.list
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}
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}
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// Now the list editing operations

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