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https://github.com/golang/go
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1a111ea2c7
Also: - better error messages in some cases - factored out function to produce syntax error at given line number Fixes #13273. Change-Id: I0192a94731cc23444680a26bd0656ef663e6da0b Reviewed-on: https://go-review.googlesource.com/16992 Reviewed-by: Chris Manghane <cmang@golang.org>
56 lines
1.7 KiB
Go
56 lines
1.7 KiB
Go
// errorcheck
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// Copyright 2015 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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// Check that we correctly construct (and report errors)
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// for unary expressions of the form <-x where we only
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// know after parsing x whether <-x is a receive operation
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// or a channel type.
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package n
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func f() {
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// test case from issue 13273
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<-chan int((chan int)(nil))
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<-chan int(nil)
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<-chan chan int(nil)
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<-chan chan chan int(nil)
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<-chan chan chan chan int(nil)
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<-chan chan chan chan chan int(nil)
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<-chan<-chan int(nil)
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<-chan<-chan<-chan int(nil)
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<-chan<-chan<-chan<-chan int(nil)
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<-chan<-chan<-chan<-chan<-chan int(nil)
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<-chan (<-chan int)(nil)
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<-chan (<-chan (<-chan int))(nil)
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<-chan (<-chan (<-chan (<-chan int)))(nil)
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<-chan (<-chan (<-chan (<-chan (<-chan int))))(nil)
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<-(<-chan int)(nil)
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<-(<-chan chan int)(nil)
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<-(<-chan chan chan int)(nil)
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<-(<-chan chan chan chan int)(nil)
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<-(<-chan chan chan chan chan int)(nil)
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<-(<-chan<-chan int)(nil)
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<-(<-chan<-chan<-chan int)(nil)
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<-(<-chan<-chan<-chan<-chan int)(nil)
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<-(<-chan<-chan<-chan<-chan<-chan int)(nil)
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<-(<-chan (<-chan int))(nil)
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<-(<-chan (<-chan (<-chan int)))(nil)
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<-(<-chan (<-chan (<-chan (<-chan int))))(nil)
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<-(<-chan (<-chan (<-chan (<-chan (<-chan int)))))(nil)
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type _ <-<-chan int // ERROR "unexpected <-, expecting chan"
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<-<-chan int // ERROR "unexpected <-, expecting chan|expecting {" (new parser: same error as for type decl)
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type _ <-chan<-int // ERROR "unexpected int, expecting chan|expecting chan"
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<-chan<-int // ERROR "unexpected int, expecting chan|expecting {" (new parser: same error as for type decl)
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}
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