From d34bbe5f5880170066a55301a576f6372634d47c Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Tue, 9 Aug 2016 12:47:43 -0700
Subject: [PATCH] Add explanatory comment to resolveTupleTypeMembers

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

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 8b31ef91930..546d8412c98 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -4107,6 +4107,7 @@ namespace ts {
         function resolveTupleTypeMembers(type: TupleType, thisArgument?: Type) {
             const arrayElementType = getUnionType(type.elementTypes);
             // Make the tuple type itself the 'this' type by including an extra type argument
+            // (Unless it's provided in the case that the tuple is a type parameter constraint)
             const arrayType = resolveStructuredTypeMembers(createTypeFromGenericGlobalType(globalArrayType, [arrayElementType, thisArgument || type]));
             const members = createTupleTypeMemberSymbols(type.elementTypes);
             addInheritedMembers(members, arrayType.properties);