[Issue 17950] cannot declare package internal symbol in package module

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17950

--- Comment #1 from Martin Nowak <code at dawg.eu> ---
The latter question was already solved in issue 10421, so it's really only a
question of allowing the qualified package name.

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