1 files changed, 12 insertions, 0 deletions

diff --git a/crates/ra_tt/src/lib.rs b/crates/ra_tt/src/lib.rs
index 0b0b9b4d2..9cc646140 100644
--- a/crates/ra_tt/src/lib.rs
+++ b/crates/ra_tt/src/lib.rs
@@ -149,3 +149,15 @@ impl fmt::Display for Punct {
         fmt::Display::fmt(&self.char, f)
     }
 }
+
+impl Subtree {
+    /// Count the number of tokens recursively
+    pub fn count(&self) -> usize {
+        self.token_trees.iter().fold(self.token_trees.len(), |acc, c| {
+            acc + match c {
+                TokenTree::Subtree(c) => c.count(),
+                _ => 0,
+            }
+        })
+    }
+}