Re: [Chicken-users] About define-syntax and expansion environment

[Peter Bex]

On Fri, Jun 14, 2013 at 10:30:28PM +0800, Xin Wang wrote:
> Hi,
> 
> I encountered a problem that previously defined macro can not be used
> inside other macro defination.
> 
> It seems that newly defined syntax does not available in macro expansion
> environment, is it intended?

That's correct; this problem is known as "phasing"; macros are defined in
their own compilation phase.  Each phase can only see macros defined in
earlier phases.

To define a macro for the macro environment, you can wrap it in a
begin-for-syntax block, or put it inside its own module and then
use import-for-syntax to import it in the module that uses it.

Cheers,
Peter
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