Clarify explicitly that BTree{Map,Set} are ordered.

Author: umanwizard

library/alloc/src/collections/btree/map.rs

@@ -31,7 +31,7 @@ pub(super) const MIN_LEN: usize = node::MIN_LEN_AFTER_SPLIT;
 // An empty map is represented either by the absence of a root node or by a
 // root node that is an empty leaf.
 
-/// A map based on a [B-Tree].
+/// An ordered map based on a [B-Tree].
 ///
 /// B-Trees represent a fundamental compromise between cache-efficiency and actually minimizing
 /// the amount of work performed in a search. In theory, a binary search tree (BST) is the optimal
@@ -65,6 +65,9 @@ pub(super) const MIN_LEN: usize = node::MIN_LEN_AFTER_SPLIT;
 /// incorrect results, aborts, memory leaks, or non-termination) but will not be undefined
 /// behavior.
 ///
+/// Entries in a `BTreeMap` are stored in ascending order according to the [`Ord`] implementation on the key.
+/// Thus, iteration methods are guaranteed to produce iterators that yield items in that order.
+///
 /// [B-Tree]: https://en.wikipedia.org/wiki/B-tree
 /// [`Cell`]: core::cell::Cell
 /// [`RefCell`]: core::cell::RefCell

library/alloc/src/collections/btree/set.rs

@@ -15,7 +15,7 @@ use super::Recover;
 
 // FIXME(conventions): implement bounded iterators
 
-/// A set based on a B-Tree.
+/// An ordered set based on a B-Tree.
 ///
 /// See [`BTreeMap`]'s documentation for a detailed discussion of this collection's performance
 /// benefits and drawbacks.
@@ -27,6 +27,9 @@ use super::Recover;
 /// incorrect results, aborts, memory leaks, or non-termination) but will not be undefined
 /// behavior.
 ///
+/// Entries in a `BTreeSet` are stored in ascending order according to the [`Ord`] implementation on the key.
+/// Thus, iteration methods are guaranteed to produce iterators that yield items in that order.
+///
 /// [`Ord`]: core::cmp::Ord
 /// [`Cell`]: core::cell::Cell
 /// [`RefCell`]: core::cell::RefCell

library/alloc/src/collections/mod.rs

@@ -14,15 +14,15 @@ pub mod vec_deque;
 #[cfg(not(no_global_oom_handling))]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub mod btree_map {
-    //! A map based on a B-Tree.
+    //! An ordered map based on a B-Tree.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub use super::btree::map::*;
 }
 
 #[cfg(not(no_global_oom_handling))]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub mod btree_set {
-    //! A set based on a B-Tree.
+    //! An ordered set based on a B-Tree.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub use super::btree::set::*;
 }