[Issue 19793] no postblit is called if cast is used for structs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19793

John Colvin <john.loughran.colvin at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |john.loughran.colvin at gmail.
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--- Comment #2 from John Colvin <john.loughran.colvin at gmail.com> ---
unlike 19774, this fails as far back as 2.060 (even if you fix the "no
constructor for ulong" error you will get when you go back that far)

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