From a400a8afecca46517e728ec0fba672372248280c Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Thu, 27 Dec 2018 14:05:14 -1000
Subject: [PATCH] Add regression test

---
 ...peArgumentDefaultUsesConstraintOnCircularDefault.ts | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tests/cases/compiler/typeArgumentDefaultUsesConstraintOnCircularDefault.ts b/tests/cases/compiler/typeArgumentDefaultUsesConstraintOnCircularDefault.ts
index b8361ea5714..ca5a270f6e7 100644
--- a/tests/cases/compiler/typeArgumentDefaultUsesConstraintOnCircularDefault.ts
+++ b/tests/cases/compiler/typeArgumentDefaultUsesConstraintOnCircularDefault.ts
@@ -1,5 +1,11 @@
-type Test<T extends string = T> = { value: T };
+type Test<T extends string = T> = { value: T };  // Error
 
 let zz: Test = { foo: "abc" };  // should error on comparison with Test<string>
 
-let zzy: Test = { value: {} };  // should error
+let zzy: Test = { value: {} };
+
+// Simplified repro from #28873
+
+class C1<T extends C1 = any> {}
+
+class C2<T extends C2<any> = any> {}