Fix #2529: explicit protection package #3651

[Kagamin via Digitalmars-d-announce]

On Tuesday, 19 August 2014 at 17:11:19 UTC, Dicebot wrote:
> Any specific ideas? I can't imagine any clean solution - and 
> proposed language extensions fits naturally into existing 
> system without introducing any new concepts. It is also 
> somewhat frequently asked about in NG.

---
module std.internal.mod1;
package(std) void foo() {}

module std.mod2;
import std.internal.mod2;
void bar() { foo(); }
---

Isn't it equivalent to
---
module std.internal_mod1;
package void foo() {}

module std.mod2;
import std.internal_mod1;
void bar() { foo(); }
---