[Issue 20458] CRTP + pass alias to virtual member to mixin = runtime crash

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20458

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

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

--- Comment #1 from Basile-z <b2.temp at gmx.com> ---
With assertions built in DMD your code triggers this : 
https://github.com/dlang/dmd/blob/498822ec8efb8e2b68e257b01fa1e097ec6e3a88/compiler/src/dmd/dsymbolsem.d#L5261,
so the vtbl seems to be started already, probably with "test" but then is
rebuild again, without

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