encoding/json: '@' not allowed in tag name

[bpowers]

What steps will reproduce the problem?
With a type like:
type LogstashMsg struct {
    Source  string     `json:"@source"`
}

What is the expected output?
the emitted json key should be "@source"

What do you see instead?
the json key will be emitted as "Source"


Which compiler are you using (5g, 6g, 8g, gccgo)?
6g

Which operating system are you using?
linux

Which version are you using?  (run 'go version')
go version weekly.2012-03-27 +b9cbd32246e3
(tip)

Please provide any additional information below.
CL forthcoming

[bpowers]

Comment 1:

http://golang.org/cl/6048047

[robpike]

Comment 2:

This issue was closed by revision 52f122d.

Status changed to Fixed.

[rsc]

Comment 3:

This issue was closed by revision 3a1462cae57f.