Take IntoIterator instead of Iterator

core/src/command.rs

@@ -65,9 +65,12 @@ impl<T> Command<T> {
     /// Once this command is run, all the commands will be exectued at once.
     ///
     /// [`Command`]: struct.Command.html
-    pub fn batch(commands: impl Iterator<Item = Command<T>>) -> Self {
+    pub fn batch(commands: impl IntoIterator<Item = Command<T>>) -> Self {
         Self {
-            futures: commands.flat_map(|command| command.futures).collect(),
+            futures: commands
+                .into_iter()
+                .flat_map(|command| command.futures)
+                .collect(),
         }
     }
 

core/src/subscription.rs

@@ -50,10 +50,11 @@ where
     ///
     /// [`Subscription`]: struct.Subscription.html
     pub fn batch(
-        subscriptions: impl Iterator<Item = Subscription<H, I, O>>,
+        subscriptions: impl IntoIterator<Item = Subscription<H, I, O>>,
     ) -> Self {
         Self {
             recipes: subscriptions
+                .into_iter()
                 .flat_map(|subscription| subscription.recipes)
                 .collect(),
         }

native/src/user_interface.rs

@@ -176,7 +176,7 @@ where
         &mut self,
         renderer: &Renderer,
         clipboard: Option<&dyn Clipboard>,
-        events: impl Iterator<Item = Event>,
+        events: impl IntoIterator<Item = Event>,
     ) -> Vec<Message> {
         let mut messages = Vec::new();