Initial commit: Go 1.23 release state

test/typeparam/issue52228.go

@@ -0,0 +1,30 @@
+// run
+
+// Copyright 2022 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 main
+
+type SomeInterface interface {
+	Whatever()
+}
+
+func X[T any]() T {
+	var m T
+
+	// for this example, this block should never run
+	if _, ok := any(m).(SomeInterface); ok {
+		var dst SomeInterface
+		_, _ = dst.(T)
+		return dst.(T)
+	}
+
+	return m
+}
+
+type holder struct{}
+
+func main() {
+	X[holder]()
+}