go/test/syntax/chan1.go

// errorcheck

// Copyright 2010 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.

package main

var c chan int
var v int

func main() {
	if c <- v { // ERROR "cannot use c <- v as value"
	}
}

var _ = c <- v // ERROR "unexpected <-"
cmd/compile/internal/gc: enable new parser by default Change-Id: I3c784986755cfbbe1b8eb8da4d64227bd109a3b0 Reviewed-on: https://go-review.googlesource.com/27203 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org> 2016-08-16 17:33:05 -06:00			`// errorcheck`
gc: remove non-blocking send, receive syntax R=ken2 CC=golang-dev https://golang.org/cl/4126043 2011-01-31 16:52:16 -07:00
all: make copyright headers consistent with one space after period Follows suit with https://go-review.googlesource.com/#/c/20111. Generated by running $ grep -R 'Go Authors. All' * \| cut -d":" -f1 \| while read F;do perl -pi -e 's/Go Authors. All/Go Authors. All/g' $F;done The code in cmd/internal/unvendor wasn't changed. Fixes #15213 Change-Id: I4f235cee0a62ec435f9e8540a1ec08ae03b1a75f Reviewed-on: https://go-review.googlesource.com/21819 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> 2016-04-10 15:32:26 -06:00			`// Copyright 2010 The Go Authors. All rights reserved.`
gc: remove non-blocking send, receive syntax R=ken2 CC=golang-dev https://golang.org/cl/4126043 2011-01-31 16:52:16 -07:00			`// Use of this source code is governed by a BSD-style`
			`// license that can be found in the LICENSE file.`

			`package main`

			`var c chan int`
			`var v int`

			`func main() {`
cmd/compile/internal/syntax: better error when an assignment is used in value context The error message is now positioned at the statement position (which is an identifing token, such as the '=' for assignments); and in case of assignments it emphasizes the assignment by putting the Lhs and Rhs in parentheses. Finally, the wording is changed from "use of * as value" to the stronger "cannot use * as value" (for which there is precedent elsewhere in the parser). Fixes #36858. Change-Id: Ic3f101bba50f58e3a1d9b29645066634631f2d61 Reviewed-on: https://go-review.googlesource.com/c/go/+/218337 Reviewed-by: Matthew Dempsky <mdempsky@google.com> 2020-02-06 16:32:40 -07:00			`if c <- v { // ERROR "cannot use c <- v as value"`
gc: remove non-blocking send, receive syntax R=ken2 CC=golang-dev https://golang.org/cl/4126043 2011-01-31 16:52:16 -07:00			`}`
			`}`

cmd/compile/internal/parser: improved a couple of error messages The new syntax tree introduced with 1.8 represents send statements (ch <- x) as statements; the old syntax tree represented them as expressions (and parsed them as such) but complained if they were used in expression context. As a consequence, some of the errors that in the past were of the form "ch <- x used as value" now look like "unexpected <- ..." because a "<-" is not valid according to Go syntax in those situations. Accept the new error message. Also: Fine-tune handling of misformed for loop headers. Also: Minor cleanups/better comments. Fixes #17590. Change-Id: Ia541dea1f2f015c1b21f5b3ae44aacdec60a8aba Reviewed-on: https://go-review.googlesource.com/37386 Reviewed-by: Matthew Dempsky <mdempsky@google.com> 2017-02-22 14:43:23 -07:00			`var _ = c <- v // ERROR "unexpected <-"`