Update to go1.24.0

test/weak.go

@@ -0,0 +1,24 @@
+// errorcheck
+
+// 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.
+
+// Test weak pointers.
+
+package p
+
+import (
+	"runtime"
+	"weak"
+)
+
+// Adapted from example in https://github.com/golang/go/issues/67552#issuecomment-2639661220
+func conversion() {
+	p := "hello"
+	a := weak.Make(&p)
+	b := (weak.Pointer[*byte])(a) // ERROR "cannot convert a \(variable of struct type weak\.Pointer\[string\]\) to type weak.Pointer\[\*byte\]"
+	c := b.Value()
+	println(**c)
+	runtime.KeepAlive(p)
+}