"innermost", "outermost", "leftmost", and "rightmost" don't need hyphens

These are all standard dictionary words and don't require hyphenation.

alloc/src/collections/btree/append.rs

@@ -79,7 +79,7 @@ impl<K, V> Root<K, V> {
                 }
                 open_node.push(key, value, right_tree);
 
-                // Go down to the right-most leaf again.
+                // Go down to the rightmost leaf again.
                 cur_node = open_node.forget_type().last_leaf_edge().into_node();
             }
 

alloc/src/collections/btree/fix.rs

@@ -102,7 +102,7 @@ impl<K, V> Root<K, V> {
     pub fn fix_right_border_of_plentiful(&mut self) {
         let mut cur_node = self.borrow_mut();
         while let Internal(internal) = cur_node.force() {
-            // Check if right-most child is underfull.
+            // Check if rightmost child is underfull.
             let mut last_kv = internal.last_kv().consider_for_balancing();
             debug_assert!(last_kv.left_child_len() >= MIN_LEN * 2);
             let right_child_len = last_kv.right_child_len();

alloc/src/collections/btree/node.rs

@@ -1521,7 +1521,7 @@ impl<'a, K: 'a, V: 'a> BalancingContext<'a, K, V> {
                     right_node.val_area_mut(..count - 1),
                 );
 
-                // Move the left-most stolen pair to the parent.
+                // Move the leftmost stolen pair to the parent.
                 let k = left_node.key_area_mut(new_left_len).assume_init_read();
                 let v = left_node.val_area_mut(new_left_len).assume_init_read();
                 let (k, v) = self.parent.replace_kv(k, v);
@@ -1570,7 +1570,7 @@ impl<'a, K: 'a, V: 'a> BalancingContext<'a, K, V> {
 
             // Move leaf data.
             {
-                // Move the right-most stolen pair to the parent.
+                // Move the rightmost stolen pair to the parent.
                 let k = right_node.key_area_mut(count - 1).assume_init_read();
                 let v = right_node.val_area_mut(count - 1).assume_init_read();
                 let (k, v) = self.parent.replace_kv(k, v);

core/src/iter/adapters/mod.rs

@@ -71,7 +71,7 @@ pub use self::{
 /// this can be useful for specializing [`FromIterator`] implementations or recovering the
 /// remaining elements after an iterator has been partially exhausted.
 ///
-/// Note that implementations do not necessarily have to provide access to the inner-most
+/// Note that implementations do not necessarily have to provide access to the innermost
 /// source of a pipeline. A stateful intermediate adapter might eagerly evaluate a part
 /// of the pipeline and expose its internal storage as source.
 ///