[Issue 18561] postblit should allow writing const/immutable members just like constructors

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18561

Steven Schveighoffer <schveiguy at yahoo.com> changed:

           What    |Removed                     |Added
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           Hardware|x86                         |All
                 OS|Windows                     |All

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