From fc8c38ac0d72350632e9261bba00a5f1674e20a3 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Tue, 28 Jul 2015 16:14:58 +0100
Subject: [PATCH] clear scope uids when removing a binding - fixes #2101

---
 packages/babel/src/traversal/scope/index.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/packages/babel/src/traversal/scope/index.js b/packages/babel/src/traversal/scope/index.js
index 4a0145a135..a7542bf069 100644
--- a/packages/babel/src/traversal/scope/index.js
+++ b/packages/babel/src/traversal/scope/index.js
@@ -1038,7 +1038,18 @@ export default class Scope {
    */
 
   removeBinding(name: string) {
+    // clear literal binding
     var info = this.getBinding(name);
-    if (info) info.scope.removeOwnBinding(name);
+    if (info) {
+      info.scope.removeOwnBinding(name);
+    }
+
+    // clear uids with this name - https://github.com/babel/babel/issues/2101
+    var scope = this;
+    do {
+      if (scope.uids[name]) {
+        scope.uids[name] = false;
+      }
+    } while(scope = scope.parent);
   }
 }