What are AST Macros?

[Nick Sabalausky]

"Steven Schveighoffer" <schveiguy at yahoo.com> wrote in message 
news:op.vfr7dti0eav7ka at localhost.localdomain...
>
> Pulling apart an  expression and reassmbling it can solve some problems, 
> but the majority of  the reason to need macros is to generate code, not to 
> read it and rewrite  it.
>

I can't help wondering if that is largely just because we're accustomed to 
not being able to do the "pull apart" without significant effort. I think we 
need to look at some of the use-cases in languages like Nemerle that have 
that sort of thing.