[Issue 15957] Disabled postblit + template mixin break opAssign with confusing error message

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15957

--- Comment #1 from Dicebot <public at dicebot.lv> ---
(checked that issue is present at least on 2.070 and 2.071)

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