goyaml: omit zero-value pointers

The documentation does not explicitly mention pointers
when marshalling, but it seems within the spirit of the
documentation that nil pointers should not be marshalled
when the omitzero tag is set.

This enables struct values to be omitted from the output if desired.

https://code.launchpad.net/~rogpeppe/goyaml/goyaml-omit-zero-pointers/+merge/83603

(do not edit description out of merge proposal)

[niemeyer, 2011-11-28 13:18:05]

Nice, LGTM

https://codereview.appspot.com/5431087/diff/1/goyaml.go
File goyaml.go (right):

https://codereview.appspot.com/5431087/diff/1/goyaml.go#newcode266
goyaml.go:266: return v.IsNil()
You can join this to the above Interface case:

    case reflect.Ptr, reflect.Interface:
        ...

[rog, 2011-11-28 13:26:19]

On 28 November 2011 13:18,  <n13m3y3r@gmail.com> wrote:
> https://codereview.appspot.com/5431087/diff/1/goyaml.go#newcode266
> goyaml.go:266: return v.IsNil()
> You can join this to the above Interface case:
>
>    case reflect.Ptr, reflect.Interface:
>        ...

done.

submitted.