Resolve function pointers using UDA during CT

[Philippe Sigaud]

On Sun, Feb 9, 2014 at 2:48 PM, Philippe Sigaud
<philippe.sigaud at gmail.com> wrote:
> import std.stdio;
> import std.traits;
> import std.typetuple;

Hmm, std.typetuple is not necessary. And std.traits is used only to
import `isCallable`.