[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

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
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--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
> -noboundscheck

The trouble is dmd is relying on _d_arraycopy() to do the bounds check, and
just uses memcpy() otherwise.

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