Initial commit: Go 1.23 release state

test/func4.go

@@ -0,0 +1,18 @@
+// errorcheck
+
+// Copyright 2009 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.
+
+// Verify that it is illegal to take the address of a function.
+// Does not compile.
+
+package main
+
+var notmain func()
+
+func main() {
+	var x = &main		// ERROR "address of|invalid"
+	main = notmain	// ERROR "assign to|invalid"
+	_ = x
+}