Fix #2529: explicit protection package #3651

[Kagamin via Digitalmars-d-announce]

On Wednesday, 20 August 2014 at 14:40:34 UTC, Dicebot wrote:
> On Wednesday, 20 August 2014 at 14:36:59 UTC, Kagamin wrote:
>> As I see on the realistic example of datetime, which is BIG, 
>> we only need to split it into a flat set of files without an 
>> overly deep package hierarchy.
>
> We _may_ split it into flat set files (solving only part of the 
> problem) but it is desirable to have a deeper package 
> hierarchy. Package hierarchy is not just an encapsulation tool, 
> it is also a great way to simplify navigation and finding 
> needed modules - something that Phobos is current terrible at 
> exactly because of flat hierarchies.

What is difficult to find? With flat structure you have all files 
right before your eyes. If you need std.datetime.systime module, 
you open std/datetime/systime.d file - that's the reason of 
needlessly restricting code structure with modules as if one size 
fits all.