From d4a04a11d2931341baac7a76d61de63b08f606a4 Mon Sep 17 00:00:00 2001
From: Yui T <yuisu@microsoft.com>
Date: Wed, 13 Jan 2016 16:48:48 -0800
Subject: [PATCH] Address PR

---
 src/services/services.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/services/services.ts b/src/services/services.ts
index 9c131f8f044..dcc01300e96 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -6010,8 +6010,8 @@ namespace ts {
                 // the symbol argument will be the symbol of an interface "C" and previousIterationSymbol is undefined,
                 // the function will add any found symbol of the property-name, then its sub-routine will call
                 // getPropertySymbolsFromBaseTypes again to walk up any base types to prevent revisiting already
-                // visited symbol, interface "C", the sub- routine will pass the current symbol as previousIterationSymbol.
-                if (previousIterationSymbolsCache && previousIterationSymbolsCache[symbol.name] === symbol) {
+                // visited symbol, interface "C", the sub-routine will pass the current symbol as previousIterationSymbol.
+                if (hasProperty(previousIterationSymbolsCache, symbol.name)) {
                     return;
                 }