What steps will reproduce the problem?
1. Create a struct that includes a GobEncoder/GobDecoder as a field.
2. Use gob.Encode on an instance of that struct.
http://play.golang.org/p/_LyE3lvhpC

What is the expected output?
A successful encoding of the struct.

What do you see instead?
An error complaining about the inability to encode a function.

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')
1.1.2

Please provide any additional information below.
I feel like checking fields for the GobEncode/Decode methods should be the default
behavior.
Otherwise, anyone who wants to use a type that requires the use of GobEncode/GobDecode
has to implement those methods in whatever struct contains it, just so it can call
GobEncode on the field, and copy the other fields verbatim. And then anyone who then
wants to include that struct as a field has to do so as well, and so on.