1 files changed, 8 insertions, 3 deletions

diff --git a/crates/ra_syntax/src/ast/edit.rs b/crates/ra_syntax/src/ast/edit.rs
index f74c9f9c6..bdaecdc43 100644
--- a/crates/ra_syntax/src/ast/edit.rs
+++ b/crates/ra_syntax/src/ast/edit.rs
@@ -251,7 +251,7 @@ impl ast::UseItem {
     #[must_use]
     pub fn with_use_tree(&self, use_tree: ast::UseTree) -> ast::UseItem {
         if let Some(old) = self.use_tree() {
-            return self.replace_descendants(iter::once((old, use_tree)));
+            return self.replace_descendant(old, use_tree);
         }
         self.clone()
     }
@@ -283,7 +283,7 @@ impl ast::UseTree {
     #[must_use]
     pub fn with_path(&self, path: ast::Path) -> ast::UseTree {
         if let Some(old) = self.path() {
-            return self.replace_descendants(iter::once((old, path)));
+            return self.replace_descendant(old, path);
         }
         self.clone()
     }
@@ -291,7 +291,7 @@ impl ast::UseTree {
     #[must_use]
     pub fn with_use_tree_list(&self, use_tree_list: ast::UseTreeList) -> ast::UseTree {
         if let Some(old) = self.use_tree_list() {
-            return self.replace_descendants(iter::once((old, use_tree_list)));
+            return self.replace_descendant(old, use_tree_list);
         }
         self.clone()
     }
@@ -466,6 +466,11 @@ pub trait AstNodeEdit: AstNode + Sized {
     }
 
     #[must_use]
+    fn replace_descendant<D: AstNode>(&self, old: D, new: D) -> Self {
+        self.replace_descendants(iter::once((old, new)))
+    }
+
+    #[must_use]
     fn replace_descendants<D: AstNode>(
         &self,
         replacement_map: impl IntoIterator<Item = (D, D)>,