blob: 5958b7db8ebd73d5e7b4f747236e6f3fd9a056c0 [file] [log] [blame]
// 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 various erroneous type switches are caught by the compiler.
// Does not compile.
package main
import "io"
func whatis(x interface{}) string {
switch x.(type) {
case int:
return "int"
case int: // ERROR "duplicate"
return "int8"
case io.Reader:
return "Reader1"
case io.Reader: // ERROR "duplicate"
return "Reader2"
case interface {
return "rw"
case interface { // ERROR "duplicate"
return "wr"
return ""
func notused(x interface{}) {
// The first t is in a different scope than the 2nd t; it cannot
// be accessed (=> declared and not used error); but it is legal
// to declare it.
switch t := 0; t := x.(type) { // ERROR "declared and not used"
case int:
_ = t // this is using the t of "t := x.(type)"