From bc5f2b9be668c7b849018828375f024a965b4f65 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Thu, 26 Mar 2015 00:48:17 +1100
Subject: [PATCH] add param to list of duplicate declaration kinds - fixes
 #1084

---
 src/babel/traversal/scope.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/babel/traversal/scope.js b/src/babel/traversal/scope.js
index e6e119209a..e28b7fb49d 100644
--- a/src/babel/traversal/scope.js
+++ b/src/babel/traversal/scope.js
@@ -223,6 +223,7 @@ export default class Scope {
     if (kind === "param") return;
     if (kind === "hoisted" && local.kind === "let") return;
 
+    if (local.kind === "let" || local.kind === "const" || local.kind === "module" || local.kind === "param") {
     if (local.kind === "let" || local.kind === "const" || local.kind === "module") {
       throw this.file.errorWithNode(id, messages.get("scopeDuplicateDeclaration", name), TypeError);
     }