Update to go1.24.1

test/fixedbugs/issue72063.go

@@ -0,0 +1,40 @@
+// run
+
+// 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
+
+import "fmt"
+
+// Y is the Y-combinator based on https://dreamsongs.com/Files/WhyOfY.pdf
+func Y[Endo ~func(RecFct) RecFct, RecFct ~func(T) R, T, R any](f Endo) RecFct {
+
+	type internal[RecFct ~func(T) R, T, R any] func(internal[RecFct, T, R]) RecFct
+
+	g := func(h internal[RecFct, T, R]) RecFct {
+		return func(t T) R {
+			return f(h(h))(t)
+		}
+	}
+	return g(g)
+}
+
+func main() {
+
+	fct := Y(func(r func(int) int) func(int) int {
+		return func(n int) int {
+			if n <= 0 {
+				return 1
+			}
+			return n * r(n-1)
+		}
+	})
+
+	want := 3628800
+	if got := fct(10); got != want {
+		msg := fmt.Sprintf("unexpected result, got: %d, want: %d", got, want)
+		panic(msg)
+	}
+}