Auto merge of rust-lang#105127 - Sp00ph:const_new, r=dtolnay

Make `VecDeque::new` const (See rust-lang#105072)
fee1-dead-contrib · Dec 20, 2022 · 1d12c3c · 1d12c3c
2 parents d6da428 + 2fba078
commit 1d12c3c
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/library/alloc/src/collections/vec_deque/mod.rs b/library/alloc/src/collections/vec_deque/mod.rs
@@ -535,12 +535,13 @@ impl<T> VecDeque<T> {
     ///
     /// let deque: VecDeque<u32> = VecDeque::new();
     /// ```
-    // FIXME: This should probably be const
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[rustc_const_stable(feature = "const_vec_deque_new", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
-    pub fn new() -> VecDeque<T> {
-        VecDeque::new_in(Global)
+    pub const fn new() -> VecDeque<T> {
+        // FIXME: This should just be `VecDeque::new_in(Global)` once that hits stable.
+        VecDeque { head: 0, len: 0, buf: RawVec::NEW }
     }
 
     /// Creates an empty deque with space for at least `capacity` elements.