// errorcheck
// Copyright 2018 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.
// Check that calling a function shadowing a built-in provides a good
// error message.
package main
func F() {
slice := []int{1, 2, 3}
len := int(2)
println(len(slice)) // ERROR "cannot call non-function len .type int., declared at"
}