[go-nuts] Passing a function that returns a specific type

Hi,

I'm trying to factor my app to reduce some duplication and to do this,
I'm trying to define a function type that takes a bunch of well know
arguments and returns interface{}. However, the concrete functions I'm
passing all return an array of a specific type. The go compiler does
not like this.

What I'd like to do is:

http://play.golang.org/p/M1vEFHcgZM

But I can do the following to fix the issue:

http://play.golang.org/p/n37_NUu5Tr

However, I'd like not to have to dumb down the functions that are being called.

Is there a better way to achieve this?

Cheers,

Ben