use impl Trait

diff --git a/src/cargo/core/resolver/types.rs b/src/cargo/core/resolver/types.rs
index 543c72e7e4a69f633247b8c3aace3f3aa42cba2a..1190121dae4ecf0621d270af5f5f9e66b9299717 100644 (file)
--- a/src/cargo/core/resolver/types.rs
+++ b/src/cargo/core/resolver/types.rs
@@ -206,13 +206,10 @@ impl DepsFrame {
             .unwrap_or(0)
     }
 
-    pub fn flatten<'s>(&'s self) -> Box<Iterator<Item = (&PackageId, Dependency)> + 's> {
-        // TODO: with impl Trait the Box can be removed
-        Box::new(
-            self.remaining_siblings
-                .clone()
-                .map(move |(_, (d, _, _))| (self.parent.package_id(), d)),
-        )
+    pub fn flatten<'s>(&'s self) -> impl Iterator<Item=(&PackageId, Dependency)> + 's {
+        self.remaining_siblings
+            .clone()
+            .map(move |(_, (d, _, _))| (self.parent.package_id(), d))
     }
 }