Make BTreeMap::new_in const

Sven Bartscher · Sven Bartscher · commit ab0ad55b61b3 · 2023-10-09T11:08:48.000+02:00
Closes rust-lang/wg-allocators#118
diff --git a/alloc/src/collections/btree/map.rs b/alloc/src/collections/btree/map.rs
@@ -669,7 +669,7 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     /// map.insert(1, "a");
     /// ```
     #[unstable(feature = "btreemap_alloc", issue = "32838")]
-    pub fn new_in(alloc: A) -> BTreeMap<K, V, A> {
+    pub const fn new_in(alloc: A) -> BTreeMap<K, V, A> {
         BTreeMap { root: None, length: 0, alloc: ManuallyDrop::new(alloc), _marker: PhantomData }
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -669,7 +669,7 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {`
`669`	`669`	`/// map.insert(1, "a");`
`670`	`670`	/// ```
`671`	`671`	`#[unstable(feature = "btreemap_alloc", issue = "32838")]`
`672`		`- pub fn new_in(alloc: A) -> BTreeMap<K, V, A> {`
	`672`	`+ pub const fn new_in(alloc: A) -> BTreeMap<K, V, A> {`
`673`	`673`	`BTreeMap { root: None, length: 0, alloc: ManuallyDrop::new(alloc), _marker: PhantomData }`
`674`	`674`	`}`
`675`	`675`	`}`