Update to go1.25.0

test/fixedbugs/issue73309.go

@@ -0,0 +1,18 @@
+// compile
+
+// Copyright 2025 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 B[T any] struct {
+	a A[T]
+}
+
+type A[T any] = func(B[T]) bool
+
+func main() {
+	var s A[int]
+	println(s)
+}