Defining a custom *constructor* (not initializer!)

[Mehrdad]

I just added this:
http://d.puremagic.com/issues/show_bug.cgi?id=8177


I don't understand the DMD code well enough to implement this
myself (the identifiers are all Greek to me...), but I honestly
think implementing it should be relatively simple, since the
default implementations are trivial (and I don't think it
requires too much code to be changed in DMD).



If someone could implement it -- or perhaps guide me through
where I should look/how I could implement it myself -- I'd really
appreciate it. :) Thanks!