From c6b77fa5dfe9a396c24035ed77a947c81a1ba42f Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Wed, 17 Jul 2019 15:15:56 -0700
Subject: [PATCH] Fix lint error

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

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 1a2fc79534e..81c2a9590ba 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -15773,7 +15773,7 @@ namespace ts {
                 // type variable. If there is more than one naked type variable, give lower priority to
                 // the inferences as they are less specific.
                 if (typeVariableCount > 0) {
-                    const unmatched = flatMap(sources, (s, i) => matched![i] ? undefined : s);
+                    const unmatched = flatMap(sources, (s, i) => matched[i] ? undefined : s);
                     if (unmatched.length) {
                         const s = getUnionType(unmatched);
                         const savePriority = priority;