Proposal: Function declaration with keyword

[Scott S. McCoy]

There isn't much reason, so far as I can see, for a function keyword.

I've never really mixed up:

int foo;
and
int foo () {
}

Something about the later just, sticks out at me as not being the
former.  Maybe it's the curly brackets, or the prototype.  Dunno!

I don't really want too much syntax added that can't be inferred,
particularly in a language like D which appears to favor inference.