#protobuf #rust Mark {Map, Repeated}::new() as public

* Matches the C++ Protobuf API.
 * Improves ergonomics by allowing users to provide Into, FromIterator, et. al. implementations.
 * Allows owned types to be returned from functions.

PiperOrigin-RevId: 615008080

rust/map.rs

@@ -163,8 +163,7 @@ where
     K: Proxied + ?Sized,
     V: ProxiedInMapValue<K> + ?Sized,
 {
-    #[allow(dead_code)]
-    pub(crate) fn new() -> Self {
+    pub fn new() -> Self {
         V::map_new(Private)
     }
 
@@ -186,6 +185,16 @@ where
     }
 }
 
+impl<K, V> Default for Map<K, V>
+where
+    K: Proxied + ?Sized,
+    V: ProxiedInMapValue<K> + ?Sized,
+{
+    fn default() -> Self {
+        Map::new()
+    }
+}
+
 #[doc(hidden)]
 impl<'msg, K: ?Sized, V: ?Sized> MapView<'msg, K, V> {
     #[doc(hidden)]

rust/repeated.rs

@@ -280,8 +280,7 @@ pub struct Repeated<T: ?Sized + ProxiedInRepeated> {
 }
 
 impl<T: ?Sized + ProxiedInRepeated> Repeated<T> {
-    #[allow(dead_code)]
-    pub(crate) fn new() -> Self {
+    pub fn new() -> Self {
         T::repeated_new(Private)
     }
 
@@ -294,6 +293,12 @@ impl<T: ?Sized + ProxiedInRepeated> Repeated<T> {
     }
 }
 
+impl<T: ?Sized + ProxiedInRepeated> Default for Repeated<T> {
+    fn default() -> Self {
+        Repeated::new()
+    }
+}
+
 impl<T: ?Sized + ProxiedInRepeated> Drop for Repeated<T> {
     fn drop(&mut self) {
         // SAFETY: only called once