1 files changed, 33 insertions, 0 deletions
diff --git a/src/internal/types/testdata/fixedbugs/issue47796.go b/src/internal/types/testdata/fixedbugs/issue47796.go
new file mode 100644
index 0000000..4c59106
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue47796.go
@@ -0,0 +1,33 @@
+// 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
+
+// parameterized types with self-recursive constraints
+type (
+	T1 /* ERROR invalid recursive type */ [P T1[P]]                            interface{}
+	T2 /* ERROR invalid recursive type */ [P, Q T2[P, Q]]                      interface{}
+	T3[P T2[P, Q], Q interface{ ~string }] interface{}
+
+	T4a /* ERROR invalid recursive type */ [P T4a[P]]                                                        interface{ ~int }
+	T4b /* ERROR invalid recursive type */ [P T4b[int]]                                                      interface{ ~int }
+	T4c /* ERROR invalid recursive type */ [P T4c[string]] interface{ ~int }
+
+	// mutually recursive constraints
+	T5 /* ERROR invalid recursive type */ [P T6[P]] interface{ int }
+	T6[P T5[P]] interface{ int }
+)
+
+// verify that constraints are checked as expected
+var (
+	_ T1[int]
+	_ T2[int, string]
+	_ T3[int, string]
+)
+
+// test case from issue
+
+type Eq /* ERROR invalid recursive type */ [a Eq[a]] interface {
+	Equal(that a) bool
+}