[Issue 7623] Allow aliasing of symbols of an aliased subtype

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=7623

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
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                 CC|                            |b2.temp at gmx.com

--- Comment #2 from Basile-z <b2.temp at gmx.com> ---
`alias foo.isOne isTwo` actually works but this is a bug since it's a
DotIdentifier expression.

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