User defined statements for D like seed have?

[Jarrett Billingsley]

"dennis luehring" <dl.soluz at gmx.net> wrote in message 
news:esncoo$pid$1 at digitalmars.com...
> example how a for statement is declared
> http://seed7.sourceforge.net/examples/declstat.htm
>
> ok i know that seed is an interpreter language but maybe there is a way 
> walter can allow something like this for his buildin statements
>
> or even better the case statement
>
> http://seed7.sourceforge.net/manual/stats.htm#case-statement
>
> as a statement-template wich can produce (with the help of the awaited 
> static foreach) a nice objectfactory from a tuple or something like this
>
> ciao denni

Stuff like this has been requested several times, but the same problem 
prevents these suggestions from being implemented: they break the separation 
of syntactic and semantic analysis.  This increases the complexity of the 
compiler greatly.

Now, some level of "custom code" may become available if/when D gets 
Lisp-style macros, which will (hopefully) allow for custom generation and 
reorganization of code by other code.