Added FromStream + Extend for LinkedList

Author: sunjay

src/collections/linked_list/extend.rs

@@ -0,0 +1,18 @@
+use std::pin::Pin;
+use std::collections::LinkedList;
+
+use crate::prelude::*;
+use crate::stream::{Extend, IntoStream};
+
+impl<T> Extend<T> for LinkedList<T> {
+    fn stream_extend<'a, S: IntoStream<Item = T> + 'a>(
+        &'a mut self,
+        stream: S,
+    ) -> Pin<Box<dyn Future<Output = ()> + 'a>> {
+        let stream = stream.into_stream();
+        //TODO: Add this back in when size_hint is added to Stream/StreamExt
+        //let (lower_bound, _) = stream.size_hint();
+        //self.reserve(lower_bound);
+        Box::pin(stream.for_each(move |item| self.push_back(item)))
+    }
+}

src/collections/linked_list/from_stream.rs

@@ -0,0 +1,24 @@
+use std::pin::Pin;
+use std::collections::LinkedList;
+
+use crate::stream::{Extend, FromStream, IntoStream};
+
+impl<T> FromStream<T> for LinkedList<T> {
+    #[inline]
+    fn from_stream<'a, S: IntoStream<Item = T>>(
+        stream: S,
+    ) -> Pin<Box<dyn core::future::Future<Output = Self> + 'a>>
+    where
+        <S as IntoStream>::IntoStream: 'a,
+    {
+        let stream = stream.into_stream();
+
+        Box::pin(async move {
+            pin_utils::pin_mut!(stream);
+
+            let mut out = LinkedList::new();
+            out.stream_extend(stream).await;
+            out
+        })
+    }
+}

src/collections/linked_list/mod.rs

@@ -0,0 +1,7 @@
+//! The Rust doubly-linked list with owned nodes
+
+mod extend;
+mod from_stream;
+
+#[doc(inline)]
+pub use std::collections::LinkedList;

src/collections/mod.rs

@@ -9,10 +9,12 @@ pub mod hash_set;
 pub mod btree_map;
 pub mod btree_set;
 pub mod binary_heap;
+pub mod linked_list;
 
 pub use vec_deque::VecDeque;
 pub use hash_map::HashMap;
 pub use hash_set::HashSet;
 pub use btree_map::BTreeMap;
 pub use btree_set::BTreeSet;
 pub use binary_heap::BinaryHeap;
+pub use linked_list::LinkedList;