From 17dd6c2de01b4ded0d7afeec39d19f13c0e858a2 Mon Sep 17 00:00:00 2001
From: Cyrus Najmabadi <cyrusn@microsoft.com>
Date: Mon, 9 Feb 2015 14:40:03 -0800
Subject: [PATCH] Be more conservative about reusing parameters.

---
 src/compiler/parser.ts | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index 8f7f68d9b6..cd0d86bed4 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -1924,9 +1924,13 @@ module ts {
         }
 
         function isReusableParameter(node: Node) {
-            // TODO: this most likely needs the same initializer check that 
-            // isReusableVariableDeclaration has.
-            return node.kind === SyntaxKind.Parameter;
+            if (node.kind !== SyntaxKind.Parameter) {
+                return false;
+            }
+
+            // See the comment in isReusableVariableDeclaration for why we do this.
+            var parameter = <ParameterDeclaration>node;
+            return parameter.initializer === undefined;
         }
 
         // Returns true if we should abort parsing.