From 70290aace4a5bb3eccbf6c1e526e65f9eb752a60 Mon Sep 17 00:00:00 2001
From: Pavel Grigorenko <GrigorenkoPV@ya.ru>
Date: Wed, 20 Aug 2025 00:25:31 +0300
Subject: [PATCH] Stabilize `vec_deque_pop_if`

---
 library/alloc/src/collections/vec_deque/mod.rs | 10 ++++------
 library/alloctests/tests/lib.rs                |  1 -
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/library/alloc/src/collections/vec_deque/mod.rs b/library/alloc/src/collections/vec_deque/mod.rs
index 2fce5c3e737e4..554e433cb34e0 100644
--- a/library/alloc/src/collections/vec_deque/mod.rs
+++ b/library/alloc/src/collections/vec_deque/mod.rs
@@ -1839,7 +1839,6 @@ impl<T, A: Allocator> VecDeque<T, A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(vec_deque_pop_if)]
     /// use std::collections::VecDeque;
     ///
     /// let mut deque: VecDeque<i32> = vec![0, 1, 2, 3, 4].into();
@@ -1849,7 +1848,7 @@ impl<T, A: Allocator> VecDeque<T, A> {
     /// assert_eq!(deque, [1, 2, 3, 4]);
     /// assert_eq!(deque.pop_front_if(pred), None);
     /// ```
-    #[unstable(feature = "vec_deque_pop_if", issue = "135889")]
+    #[stable(feature = "vec_deque_pop_if", since = "CURRENT_RUSTC_VERSION")]
     pub fn pop_front_if(&mut self, predicate: impl FnOnce(&mut T) -> bool) -> Option<T> {
         let first = self.front_mut()?;
         if predicate(first) { self.pop_front() } else { None }
@@ -1862,7 +1861,6 @@ impl<T, A: Allocator> VecDeque<T, A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(vec_deque_pop_if)]
     /// use std::collections::VecDeque;
     ///
     /// let mut deque: VecDeque<i32> = vec![0, 1, 2, 3, 4].into();
@@ -1872,10 +1870,10 @@ impl<T, A: Allocator> VecDeque<T, A> {
     /// assert_eq!(deque, [0, 1, 2, 3]);
     /// assert_eq!(deque.pop_back_if(pred), None);
     /// ```
-    #[unstable(feature = "vec_deque_pop_if", issue = "135889")]
+    #[stable(feature = "vec_deque_pop_if", since = "CURRENT_RUSTC_VERSION")]
     pub fn pop_back_if(&mut self, predicate: impl FnOnce(&mut T) -> bool) -> Option<T> {
-        let first = self.back_mut()?;
-        if predicate(first) { self.pop_back() } else { None }
+        let last = self.back_mut()?;
+        if predicate(last) { self.pop_back() } else { None }
     }
 
     /// Prepends an element to the deque.
diff --git a/library/alloctests/tests/lib.rs b/library/alloctests/tests/lib.rs
index fcfc7f8dd296d..2992f1238e973 100644
--- a/library/alloctests/tests/lib.rs
+++ b/library/alloctests/tests/lib.rs
@@ -37,7 +37,6 @@
 #![feature(local_waker)]
 #![feature(str_as_str)]
 #![feature(strict_provenance_lints)]
-#![feature(vec_deque_pop_if)]
 #![feature(vec_deque_truncate_front)]
 #![feature(unique_rc_arc)]
 #![feature(macro_metavar_expr_concat)]