[Issue 12580] [REG2.066a] dup() won't accept void[]

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12580

--- Comment #3 from Walter Bright <bugzilla at digitalmars.com> ---
Bug introduced by https://github.com/D-Programming-Language/druntime/pull/760

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