1 files changed, 26 insertions, 0 deletions
diff --git a/src/internal/types/testdata/fixedbugs/issue49439.go b/src/internal/types/testdata/fixedbugs/issue49439.go
new file mode 100644
index 0000000..b8ad495
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue49439.go
@@ -0,0 +1,26 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+import "unsafe"
+
+type T0 /* ERROR invalid recursive type */ [P T0[P]] struct{}
+
+type T1 /* ERROR invalid recursive type */ [P T2[P]] struct{}
+type T2[P T1[P]] struct{}
+
+type T3 /* ERROR invalid recursive type */ [P interface{ ~struct{ f T3[int] } }] struct{}
+
+// valid cycle in M
+type N[P M[P]] struct{}
+type M[Q any] struct { F *M[Q] }
+
+// "crazy" case
+type TC[P [unsafe.Sizeof(func() {
+        type T [P [unsafe.Sizeof(func(){})]byte] struct{}
+})]byte] struct{}
+
+// test case from issue
+type X /* ERROR invalid recursive type */ [T any, PT X[T]] interface{}