From 39d1c8b84490eb1da66ef15396188430635723c6 Mon Sep 17 00:00:00 2001
From: kpreisser <kpreisser@users.noreply.github.com>
Date: Sun, 5 Mar 2017 14:25:59 +0100
Subject: [PATCH] Allow the right-hand side of an 'in' expression to be of
 non-primitive object type. Fixes #14269

---
 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 a4c0acc405d..300fc2e8bef 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -15546,7 +15546,7 @@ namespace ts {
             if (!(isTypeComparableTo(leftType, stringType) || isTypeOfKind(leftType, TypeFlags.NumberLike | TypeFlags.ESSymbol))) {
                 error(left, Diagnostics.The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol);
             }
-            if (!isTypeAnyOrAllConstituentTypesHaveKind(rightType, TypeFlags.Object | TypeFlags.TypeVariable)) {
+            if (!isTypeAnyOrAllConstituentTypesHaveKind(rightType, TypeFlags.Object | TypeFlags.TypeVariable | TypeFlags.NonPrimitive)) {
                 error(right, Diagnostics.The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter);
             }
             return booleanType;