Proposal: static ctor priority

[Deewiant]

Daniel Keep wrote:
> Example:
> 
> module a;
> import b;
> 
> pragma(priority, 2)
> static this()
> {
>     // Do stuff
> }
> 
> module b;
> import a;
> 
> // defaults to priority 1.
> static this()
> {
>     // Do other stuff
> }
> 
> (NB: modules are initialised from higher priority (int.max) to lowest
> (int.min))
> 
> This would allow developers to manually break these cycles by specifying
>  the relative order they should be initialised in.  For bonus points,
> make this possible:
> 
> module a;
> import b;
> 
> pragma(priority, b+1)
> static this() {
> ...
> 
> This should be much easier to implement than flow analysis, whilst still
> solving the problem.
> 
> Comments?

We already have the parentheses after "static this", why not reuse them? We
don't need a pragma:

static this(1) { ... }
static this(2) { called before the above... }
static this()  { called whenever... }

If we'll ever get more than one module constructor per module (I hope we will),
"b+1" priority would have to mean "max(all in b) + 1". Not a problem, just
making a note.

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