[Issue 19441] alias this causes partial assignment

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19441

--- Comment #11 from Eyal <eyal at weka.io> ---
It's not fine if only LHS side uses it and causes a partial assignment. x = y 
should assign whole of x. If "alias this" exists in x but it still assigns the
whole of x, that's fine.

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