From 520d7fff49d96ba71b9b441e25ff00c772070dff Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Fri, 1 Sep 2017 14:19:12 -0700
Subject: [PATCH] Add depth limit to recursive type reference id generation

4 is the limit.
---
 src/compiler/checker.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 22abe7cd57e..764307de7a9 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -9790,7 +9790,7 @@ namespace ts {
          * getTypeReferenceId(A<T, number, U>) returns "111=0-12=1"
          *   where A.id=111 and number.id=12
          */
-        function getTypeReferenceId(type: TypeReference, typeParameters: Type[]) {
+        function getTypeReferenceId(type: TypeReference, typeParameters: Type[], depth = 0) {
             let result = "" + type.target.id;
             for (const t of type.typeArguments) {
                 if (isUnconstrainedTypeParameter(t)) {
@@ -9801,8 +9801,8 @@ namespace ts {
                     }
                     result += "=" + index;
                 }
-                else if (isTypeReferenceWithGenericArguments(t)) {
-                    result += "<" + getTypeReferenceId(t, typeParameters) + ">";
+                else if (depth < 4 && isTypeReferenceWithGenericArguments(t)) {
+                    result += "<" + getTypeReferenceId(t, typeParameters, depth + 1) + ">";
                 }
                 else {
                     result += "-" + t.id;