Libdparse needs to be updated to recognize AliasAssign declarations

[RazvanN]

Hello fellow D people,

Is there anyone in the community sufficiently familiar with 
libdparse [1] as to make it recognize an AliasAssign declaration 
[2]? Andralex has made a series of PRs to phobos that make use of 
the new technology. As a result the code is greatly simplified 
[3] and it comes with some memory savings [4]. However, these PRs 
are blocked because of the style checker that does not recognize 
alias assignments.

If anyone with some experience with the libdparse repo would be 
able to fix this, that would be greatly appreciated!

Cheers,
RazvanN

[1] https://github.com/dlang-community/libdparse
[2] https://github.com/dlang/dmd/pull/11846
[3] https://github.com/dlang/phobos/pull/8040
[4] https://github.com/dlang/phobos/pull/8033