From ee13f31010ff337db931a264dfbc694944cd2a0d Mon Sep 17 00:00:00 2001
From: Andy Hanson <anhans@microsoft.com>
Date: Thu, 16 Feb 2017 14:04:49 -0800
Subject: [PATCH] Handle undefined import name

---
 src/services/findAllReferences.ts                    | 2 +-
 tests/cases/fourslash/findAllRefsForDefaultExport.ts | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/services/findAllReferences.ts b/src/services/findAllReferences.ts
index d114967f97f46..f1db5810c4169 100644
--- a/src/services/findAllReferences.ts
+++ b/src/services/findAllReferences.ts
@@ -154,7 +154,7 @@ namespace ts.FindAllReferences {
             const importDecl = importSpecifier.parent as ts.ImportDeclaration;
             Debug.assert(importDecl.moduleSpecifier === importSpecifier);
             const defaultName = importDecl.importClause.name;
-            const defaultReferencedSymbol = checker.getAliasedSymbol(checker.getSymbolAtLocation(defaultName));
+            const defaultReferencedSymbol = defaultName && checker.getAliasedSymbol(checker.getSymbolAtLocation(defaultName));
             if (symbol === defaultReferencedSymbol) {
                 return defaultName.text;
             }
diff --git a/tests/cases/fourslash/findAllRefsForDefaultExport.ts b/tests/cases/fourslash/findAllRefsForDefaultExport.ts
index c518bb8f59e78..98e74e281ada7 100644
--- a/tests/cases/fourslash/findAllRefsForDefaultExport.ts
+++ b/tests/cases/fourslash/findAllRefsForDefaultExport.ts
@@ -7,5 +7,8 @@
 ////import [|{| "isWriteAccess": true, "isDefinition": true |}g|] from "./a";
 /////*ref*/[|g|]();
 
+// @Filename: c.ts
+////import { f } from "./a";
+
 verify.singleReferenceGroup("function f(): void");
 verify.goToDefinition("ref", "def");