[Issue 18010] Undefined reference to _d_arraycopy when copying arrays in -betterC

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18010

--- Comment #3 from Walter Bright <bugzilla at digitalmars.com> ---
https://github.com/dlang/dmd/pull/7867

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