Initial commit: Go 1.23 release state

src/cmd/gofmt/testdata/rewrite3.input

@@ -0,0 +1,14 @@
+//gofmt -r=x->x
+
+// Copyright 2011 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
+
+// Field tags are *ast.BasicLit nodes that are nil when the tag is
+// absent. These nil nodes must not be mistaken for expressions,
+// the rewriter should not try to dereference them. Was issue 2410.
+type Foo struct {
+	Field int
+}