From 8a87d519565544b7082510af7547b84919d1b88b Mon Sep 17 00:00:00 2001
From: Mohamed Hegazy <mhegazy@microsoft.com>
Date: Mon, 15 Dec 2014 17:32:11 -0800
Subject: [PATCH] Do not use the file name in errors unless it exists

---
 src/compiler/parser.ts | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index ea5b35cbce1..e145a4ec447 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -5362,8 +5362,13 @@ module ts {
 
                 // We haven't looked for this file, do so now and cache result
                 var file = filesByName[canonicalName] = host.getSourceFile(filename, options.target, hostErrorMessage => {
-                    errors.push(createFileDiagnostic(refFile, refStart, refLength,
-                        Diagnostics.Cannot_read_file_0_Colon_1, filename, hostErrorMessage));
+                    if (refFile) {
+                        errors.push(createFileDiagnostic(refFile, refStart, refLength,
+                            Diagnostics.Cannot_read_file_0_Colon_1, filename, hostErrorMessage));
+                    }
+                    else {
+                        errors.push(createCompilerDiagnostic(Diagnostics.Cannot_read_file_0_Colon_1, filename, hostErrorMessage));
+                    }
                 });
                 if (file) {
                     seenNoDefaultLib = seenNoDefaultLib || file.hasNoDefaultLib;