[Issue 19430] wrong code for `this =`, corrupted memory issue

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19430

--- Comment #2 from Илья Ярошенко <ilyayaroshenko at gmail.com> ---
The number of the constructor (including postblits) must match the number of
destructors. Assume you have a reference counted member. Then the code in the
issue will cause a corrupted memory error.

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