[Issue 19234] betterC TypeInfo error when using slice copy on Structs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19234

--- Comment #2 from Nathan S. <n8sh.secondary at hotmail.com> ---
I have a fix for just the slice copy so I'll re-separate the issue of slice
assignment.

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