1.16 beta 1 - Getting an error trying to use the "embed" package

[Amit Saha]

Hi all, has anyone tried using the “embed” package in the 1.16 beta 1 release?

My data.go file looks as:

package main

import "embed"

//go:embed templates/main.go.tmpl
var tmplMainGo []byte


When I build the program, I get this:

~/go/bin/go1.16beta1 build
# github.com/amitsaha/go-embed
./data.go:3:8: imported and not used: “embed”


Now, I understand the error, but what’s the fix? I blindly tried to remove the import, but then I get:

# github.com/amitsaha/go-embed
./data.go:5:3: //go:embed only allowed in Go files that import “embed"

What am I doing wrong?

My test code is here: https://github.com/amitsaha/go-embed

Thank you.

Best Regards,
Amit.

[Volker Dobler]

Use

    import _ "embed"  // note the _

Your code does not  use package embed. A comment does

not qualify as usage. As yous must import it for //go:embed

comments to work you have to use a "side-effects-only"-import.

V.

[Amit Saha]

On Fri, 18 Dec 2020, 11:44 pm Volker Dobler, <dr.volke...@gmail.com> wrote:

Use

    import _ "embed"  // note the _

Your code does not  use package embed. A comment does

not qualify as usage. As yous must import it for //go:embed

comments to work you have to use a "side-effects-only"-import.

Ah yes. This should be mentioned in the package documentation. Probably it is not.

Thank you.

V.

On Friday, 18 December 2020 at 13:38:10 UTC+1 amits...@gmail.com wrote:

Hi all, has anyone tried using the “embed” package in the 1.16 beta 1 release?

My data.go file looks as:

package main

import "embed"

//go:embed templates/main.go.tmpl
var tmplMainGo []byte


When I build the program, I get this:

~/go/bin/go1.16beta1 build
# github.com/amitsaha/go-embed
./data.go:3:8: imported and not used: “embed”


Now, I understand the error, but what’s the fix? I blindly tried to remove the import, but then I get:

# github.com/amitsaha/go-embed
./data.go:5:3: //go:embed only allowed in Go files that import “embed"

What am I doing wrong?

My test code is here: https://github.com/amitsaha/go-embed

Thank you.

Best Regards,
Amit.

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[Ian Lance Taylor]

On Fri, Dec 18, 2020 at 4:50 AM Amit Saha <amits...@gmail.com> wrote:
>
> On Fri, 18 Dec 2020, 11:44 pm Volker Dobler, <dr.volke...@gmail.com> wrote:
>>
>> Use
>>
>> import _ "embed" // note the _
>>
>> Your code does not use package embed. A comment does
>> not qualify as usage. As yous must import it for //go:embed
>> comments to work you have to use a "side-effects-only"-import.
>
>
> Ah yes. This should be mentioned in the package documentation. Probably it is not.

This is fairly likely to change before the final release. See
https://golang.org/issue/43217.

Ian

[Amit Saha]

Thank you

Ian