From b321d50170ccd84a2bdd68ac301b370b74f9bcfb Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Mon, 5 Dec 2016 12:29:03 -0800
Subject: [PATCH] Sub-subclasses can access protected constructor

---
 src/compiler/checker.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 903c8cfda1c..96eefb68135 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -13467,13 +13467,14 @@ namespace ts {
                 const containingClass = getContainingClass(node);
                 if (containingClass) {
                     const containingType = getTypeOfNode(containingClass);
-                    const baseTypes = getBaseTypes(<InterfaceType>containingType);
-                    if (baseTypes.length) {
+                    let baseTypes = getBaseTypes(containingType as InterfaceType);
+                    while (baseTypes.length) {
                         const baseType = baseTypes[0];
                         if (modifiers & ModifierFlags.Protected &&
                             baseType.symbol === declaration.parent.symbol) {
                             return true;
                         }
+                        baseTypes = getBaseTypes(baseType as InterfaceType);
                     }
                 }
                 if (modifiers & ModifierFlags.Private) {