Why not local identifiers? It won't hurt anyway, since:
(fn (x) x) == (fn (y) y)
Quoted symbols are more problematic. The problem is that you can't determine how macros will bash quoted symbols. For example, (tag (x) ...) implicitly creates 'x. And prior to replacement, you can't be sure if the 'tag here is pg:arc1's tag or some other module's 'tag macro.
An alternative is to make the (pr ...) versions of similarly-named symbols in different modules the same; this probably involves hacking (coerce ... 'string) to cut out the module name for symbols.
Hmm, probably means we need a separate macro namespace. Heck, stuff like (let obj (table) (obj 1)) doesn't do as you expect, because of the mixing of macros in the same namespace as functions and values.
