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cmd/compile/internal/gc: fix parsing of <-x (recv op vs recv-only chan)
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>
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Original file line number | Diff line number | Diff line change |
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// errorcheck | ||
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// 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. | ||
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// 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. | ||
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package n | ||
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func f() { | ||
// test case from issue 13273 | ||
<-chan int((chan int)(nil)) | ||
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<-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) | ||
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<-chan<-chan int(nil) | ||
<-chan<-chan<-chan int(nil) | ||
<-chan<-chan<-chan<-chan int(nil) | ||
<-chan<-chan<-chan<-chan<-chan int(nil) | ||
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<-chan (<-chan int)(nil) | ||
<-chan (<-chan (<-chan int))(nil) | ||
<-chan (<-chan (<-chan (<-chan int)))(nil) | ||
<-chan (<-chan (<-chan (<-chan (<-chan int))))(nil) | ||
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<-(<-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) | ||
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<-(<-chan<-chan int)(nil) | ||
<-(<-chan<-chan<-chan int)(nil) | ||
<-(<-chan<-chan<-chan<-chan int)(nil) | ||
<-(<-chan<-chan<-chan<-chan<-chan int)(nil) | ||
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<-(<-chan (<-chan int))(nil) | ||
<-(<-chan (<-chan (<-chan int)))(nil) | ||
<-(<-chan (<-chan (<-chan (<-chan int))))(nil) | ||
<-(<-chan (<-chan (<-chan (<-chan (<-chan int)))))(nil) | ||
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type _ <-<-chan int // ERROR "unexpected <-, expecting chan" | ||
<-<-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" | ||
<-chan<-int // ERROR "unexpected int, expecting chan|expecting {" (new parser: same error as for type decl) | ||
} |