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/usr/share/go-1.6/test/fixedbugs/issue12413.go is in golang-1.6-src 1.6.1-0ubuntu1.

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// compile

// Copyright 2015 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.

// issue 12413: invalid variable name x in type switch: code would fail
// to compile if the variable used in the short variable declaration was
// previously declared as a constant.

package main

func main() {
	const x = 42
	switch x := interface{}(nil).(type) {
	default:
		_ = x
	}
}