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// errorcheck
// 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.
// Check that we correctly construct (and report errors)
// for unary expressions of the form <-x where we only
// know after parsing x whether <-x is a receive operation
// or a channel type.
package n
func f() {
// test case from issue 13273
<-chan int((chan int)(nil))
<-chan int(nil)
<-chan chan int(nil)
<-chan chan chan int(nil)
<-chan chan chan chan int(nil)
<-chan chan chan chan chan int(nil)
<-chan<-chan int(nil)
<-chan<-chan<-chan int(nil)
<-chan<-chan<-chan<-chan int(nil)
<-chan<-chan<-chan<-chan<-chan int(nil)
<-chan (<-chan int)(nil)
<-chan (<-chan (<-chan int))(nil)
<-chan (<-chan (<-chan (<-chan int)))(nil)
<-chan (<-chan (<-chan (<-chan (<-chan int))))(nil)
<-(<-chan int)(nil)
<-(<-chan chan int)(nil)
<-(<-chan chan chan int)(nil)
<-(<-chan chan chan chan int)(nil)
<-(<-chan chan chan chan chan int)(nil)
<-(<-chan<-chan int)(nil)
<-(<-chan<-chan<-chan int)(nil)
<-(<-chan<-chan<-chan<-chan int)(nil)
<-(<-chan<-chan<-chan<-chan<-chan int)(nil)
<-(<-chan (<-chan int))(nil)
<-(<-chan (<-chan (<-chan int)))(nil)
<-(<-chan (<-chan (<-chan (<-chan int))))(nil)
<-(<-chan (<-chan (<-chan (<-chan (<-chan int)))))(nil)
type _ <-<-chan int // ERROR "unexpected <-, expected chan|expected .*chan.*"
<-<-chan int // ERROR "unexpected <-, expected chan|expecting {" (new parser: same error as for type decl)
type _ <-chan<-int // ERROR "unexpected int, expected chan|expected .*chan.*|expected chan|expected .*;.* or .*}.* or newline"
<-chan<-int // ERROR "unexpected int, expected chan|expecting {" (new parser: same error as for type decl)
}