1 files changed, 69 insertions, 0 deletions
diff --git a/test/typeparam/mdempsky/15.go b/test/typeparam/mdempsky/15.go
new file mode 100644
index 0000000..b03ad6f
--- /dev/null
+++ b/test/typeparam/mdempsky/15.go
@@ -0,0 +1,69 @@
+// run -goexperiment fieldtrack
+
+// 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.
+
+// Test that generics, promoted methods, and //go:nointerface
+// interoperate as expected.
+
+package main
+
+import (
+	"reflect"
+)
+
+func TypeString[T any]() string {
+	return reflect.TypeOf(new(T)).Elem().String()
+}
+
+func Test[T, Bad, Good any]() {
+	switch interface{}(new(T)).(type) {
+	case Bad:
+		println("FAIL:", TypeString[T](), "matched", TypeString[Bad]())
+	case Good:
+		// ok
+	default:
+		println("FAIL:", TypeString[T](), "did not match", TypeString[Good]())
+	}
+}
+
+func TestE[T any]() { Test[T, interface{ EBad() }, interface{ EGood() }]() }
+func TestX[T any]() { Test[T, interface{ XBad() }, interface{ XGood() }]() }
+
+type E struct{}
+
+//go:nointerface
+func (E) EBad()  {}
+func (E) EGood() {}
+
+type X[T any] struct{ E }
+
+//go:nointerface
+func (X[T]) XBad()  {}
+func (X[T]) XGood() {}
+
+type W struct{ X[int] }
+
+func main() {
+	_ = E.EGood
+	_ = E.EBad
+
+	TestE[E]()
+
+	_ = X[int].EGood
+	_ = X[int].EBad
+	_ = X[int].XGood
+	_ = X[int].XBad
+
+	TestE[X[int]]()
+	TestX[X[int]]()
+
+	_ = W.EGood
+	_ = W.EBad
+	_ = W.XGood
+	_ = W.XBad
+
+	TestE[W]()
+	TestX[W]()
+}