[Issue 21349] copy and postblit constructors aren't compatible

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21349

--- Comment #5 from Paul Backus <snarwin+bugzilla at gmail.com> ---
When an aggregate has both old and new style members, the compiler generates
both a copy constructor and a postblit, and the postblit takes precedence.

I agree that this is a bug in the language design: the generated copy
constructor will call the members' postblits, so it should be the one that
takes precedence.

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