...src/link.c
    M src/macro.c
    M src/macro.h
    M src/mangle.c...

...while it doesn't have a flexible macro system, external processors can be used to...

...pass some *.ddoc file with some DDOC macro to dmd but I don't' whether...

...in this situation is more or less like a C macro.

#define r1 regex("bla")

...c
    M src/irstate.c
    M src/macro.c
    M src/mars.c
    M src...

...where D supports over-powered macros, a macro `def` could be defined s.t.

    def...

...parametric polymorphism and not a form of macro if that is what you mean. I...

...can be thought of like a C macro, being pasted inside source code.

Avoid enums...

...think of it as a higher order macro)
* immutable represents a value, which *may* be...

Yeah looks like my knowledge about their macro system is very outdated. Looks promising.