Selfref 0.4 soundness review request

selfref is a fairly well documented crate for self-referential structs. it used to be a bit of a pain to use due to issues we had with closures when used with GATs/associated types, but we're working on fixing support for closures (with selfref 0.3 significantly improving the ability to use self-referential structs, with the caveat that constructing them is still a pain).

selfref 0.4 should bring similar improvements to construction, but we're unsure if it's sound. please take a look. blob

disclaimer: the crate (currently) relies on the !Unpin hack, but we're working with a few folks on a more proper way of doing this in the future. please disregard the !Unpin hack as a soundness issue.

cc @steffahn

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