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// errchk $G -e $D/$F.go

// 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.

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 {

                r()

                w()

        }:

                return "rw"

        case interface {        // GCCGO_ERROR "duplicate"

                w()

                r()

        }: // GC_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)"

        }

}