Extra use case of `Claim`?

[ifsheldon]

I've been following your proposal on Claim. An unexpected benefit from add Claim may be actually impacting how and what rustc decides to do to Copy values.

In my recent issue, a comment says the behavior that is conservative may be due to the aversion to copy large Copy values. The reason is fair enough but the behavior is a quirk nonetheless. So, then I thought, maybe when Claim is implemented, some large values are not Claim then the compiler can be safely ensured that it's not copying a large value, say [u8; 1024] so that it can just claim or copy a value for me in the case of my issue.