Expose HashMap:VacantEntry:insert_entry

Author: passcod

library/std/src/collections/hash/map.rs

@@ -2793,6 +2793,7 @@ impl<'a, K: 'a, V: 'a> VacantEntry<'a, K, V> {
     /// # Examples
     ///
     /// ```
+    /// #![feature(entry_insert)]
     /// use std::collections::HashMap;
     /// use std::collections::hash_map::Entry;
     ///
@@ -2804,7 +2805,8 @@ impl<'a, K: 'a, V: 'a> VacantEntry<'a, K, V> {
     /// assert_eq!(map["poneyland"], 37);
     /// ```
     #[inline]
-    fn insert_entry(self, value: V) -> OccupiedEntry<'a, K, V> {
+    #[unstable(feature = "entry_insert", issue = "65225")]
+    pub fn insert_entry(self, value: V) -> OccupiedEntry<'a, K, V> {
         let base = self.base.insert_entry(value);
         OccupiedEntry { base }
     }