From 347326d2e8ebbacca12d8e1398b86eff6dcfb2c5 Mon Sep 17 00:00:00 2001
From: Yonatan Reicher <yony252525@gmail.com>
Date: Tue, 23 Jul 2024 21:03:48 +0000
Subject: [PATCH] Added `fn root(&self) -> Id` to `RecExpr`. (#321)

---
 src/language.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/language.rs b/src/language.rs
index 6a4b6fbd..3da29a69 100644
--- a/src/language.rs
+++ b/src/language.rs
@@ -457,6 +457,11 @@ impl<L: Language> RecExpr<L> {
         }
         true
     }
+
+    /// Get the root node of this expression. When adding a new node via `add`, it becomes the new root.
+    pub fn root(&self) -> Id {
+        Id::from(self.nodes.len() - 1)
+    }
 }
 
 impl<L: Language> Index<Id> for RecExpr<L> {