Re: DIP 50 - AST macros

[Walter Bright]

I forgot to mention that "expression templates" can be used in D in an 
equivalent manner that they are used in C++, and can cover much of the 
functionality used in AST macros.

Eric Anderton who wrote a regex expression template module a few years back:
http://www.dsource.org/projects/ddl/browser/trunk/meta/regex.d