From ee4baef51fba69ed6fcd9ea89cd44d3f77f21a46 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Sun, 1 May 2016 21:08:53 -0700
Subject: [PATCH] Applied suggested change.

---
 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 ef53b6e7d61..f182ce899ce 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5912,7 +5912,7 @@ namespace ts {
                     }
 
                     // The constraint may need to be further instantiated with its 'this' type.
-                    constraint = getTypeWithThisArgument(constraint);
+                    constraint = getTypeWithThisArgument(constraint, source);
 
                     // Report constraint errors only if the constraint is not the empty object type
                     const reportConstraintErrors = reportErrors && constraint !== emptyObjectType;