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cmd/compile: imperfect compile error message #44321

go101 opened this issue Feb 17, 2021 · 2 comments

cmd/compile: imperfect compile error message #44321

go101 opened this issue Feb 17, 2021 · 2 comments


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@go101 go101 commented Feb 17, 2021

What version of Go are you using (go version)?

$ go version
go version go1.16 linux/amd64

Does this issue reproduce with the latest release?


What did you do?

  package main

  func main() {
    var a, b = 1, -2

What did you expect to see?

syntax error: a is not channel, unexpected <-

What did you see instead?

syntax error: unexpected <-, expecting comma or )

BTW, go fmt doesn't work for much code which fails to compile.
But I think it should work here.

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@griesemer griesemer commented Feb 17, 2021

a <- b is a send statement, not an expression. The error message seems quite reasonable. The parser usually doesn't comment on what type a variable is, either.

@griesemer griesemer added this to the Unplanned milestone Feb 17, 2021
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@go101 go101 commented Feb 17, 2021

I understand. But the message doesn't make people realize the real cause at the first time.
And, the second half "expecting comma or )" is not very accurate. Comma and ) are not the only possibilities.

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