[phobos] Proposal of StopWatch module

[SHOO]

> We don't have a formal document yet, though the matter is pretty clear
> to us. Consider:
>
> class X {
> ...
> void method() { ... }
> }
>
> void fun() {
> scope x = new X;
> x.method();
> }
>
> Now consider what steps you need to make sure that the code is safe.
> Essentially x must not escape the scope of foo(). But x is passed inside
> method() as "this". So the compiler must make sure that method() does
> not escape "this". But then method() may call other functions and pass
> "this" to them, or may not even be available to the compiler at the
> point where scope is used. This is an unsolvable problem without making
> extensive changes to the language.
>
> As I'm sure you know we're trying to help the matter with library-based
> approaches, but leaving straight in the language a feature that is
> impossible to make safe is not admissible. Walter and I agree that scope
> must be abolished.
>
>
> Andrei

I understand it well. Thank you.
When is it going to mark deprecated? D3?
I think that you had better announce it as soon as possible.