From 4313ecf7588c50d8b0679eae8b9ac03f565854c1 Mon Sep 17 00:00:00 2001
From: Andy <anhans@microsoft.com>
Date: Mon, 19 Jun 2017 15:26:26 -0700
Subject: [PATCH] Use custom error message in Debug.fail (#16625)

---
 src/compiler/core.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index 8e5bf017924..be0585e31bd 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -2344,7 +2344,7 @@ namespace ts {
 
         export function fail(message?: string, stackCrawlMark?: Function): void {
             debugger;
-            const e = new Error(message ? `Debug Failure. ` : "Debug Failure.");
+            const e = new Error(message ? `Debug Failure. ${message}` : "Debug Failure.");
             if ((<any>Error).captureStackTrace) {
                 (<any>Error).captureStackTrace(e, stackCrawlMark || fail);
             }