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https://github.com/golang/go
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1912632019
bonus: type switch now detects multiple uses of identical interface types. bonus: interface types are now order-independent, following the spec. R=ken2 CC=golang-dev https://golang.org/cl/194053
29 lines
562 B
Go
29 lines
562 B
Go
// errchk $G -e $D/$F.go
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "io"
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func whatis(x interface{}) string {
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switch x.(type) {
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case int:
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return "int"
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case int: // ERROR "duplicate"
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return "int8"
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case io.Reader:
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return "Reader1"
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case io.Reader: // ERROR "duplicate"
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return "Reader2"
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case interface { r(); w() }:
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return "rw"
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case interface { w(); r() }: // ERROR "duplicate"
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return "wr"
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}
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return ""
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}
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