[Grace-core] Lazy initialisation and circular definitions

[Marco Servetto]

> short answer - mutually recursive type definitions need something.
> Do we do something special purpose or more general
> more generally - mutually recursive definitions need something...
> which is why I like the "lazy {}" option (just like Scheme's delay)
> not in the core language, there if you need it.

So you like to write lazy in mutually recursive type definitions?