Initial commit: Go 1.23 release state

test/fixedbugs/issue6004.go

@@ -0,0 +1,14 @@
+// errorcheck
+
+// Copyright 2013 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
+
+func main() {
+	_ = nil                  // ERROR "use of untyped nil"
+	_, _ = nil, 1            // ERROR "use of untyped nil"
+	_, _ = 1, nil            // ERROR "use of untyped nil"
+	_ = append(nil, 1, 2, 3) // ERROR "untyped nil|nil"
+}