Golang程序  |  20行  |  303 B

// errorcheck

// Copyright 2012 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 "os"

type T struct {
	File int
}

func main() {
	_ = T {
		os.File: 1, // ERROR "unknown T? ?field"
	}
}