Owned references to contents in an earlier stack frame (&own, &move, etc) #998
Description
A common request is to have a way to pass a reference that actually owns its referent. The idea originated long ago in an attempt to find a suitable type for Drop, but it's not a perfect fit there (you really want to not own the struct being dropped, just its fields). It has since resurfaced as a means to pass ownership of unsized types (but see #990 as well) and various other use cases.