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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)"
        }
}