[Issue 20076] [2.087.0] structs won't copy when using alias this and being assigned a const instance of said struct

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20076

--- Comment #1 from Ethan Watson <gooberman at gmail.com> ---
More digging makes me think instead that because I'm using class objects, it
actually needs a const-removing cast. And since it's not there, it's silently
assuming the alias this is the correct thing to use.

So I can deal with it now at least, but that error message is another case of
"Confusing D error message"

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