by ashish.jain@raweng.com:

Before filing a bug, please check whether it has been fixed since
the latest release: run "hg pull", "hg update default", rebuild, and
retry
what you did to
reproduce the problem.  Thanks.

What steps will reproduce the problem?
1.Running a program 
2.
3.

What is the expected output?
{"A":[]}


What do you see instead?
{"A":null}


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


Which operating system are you using?
ubuntu natty 11.04

Which revision are you using?  (hg identify)
weekly.2012-02-22 +96bd78e7d35e


Please provide any additional information below.
According to docs arrays and slices are encoded as arrays but zero size arrays in struct
gives me unexpected output.
http://play.golang.org/p/TUprfnPIo5