Commits on Apr 8, 2022

1. Add ThinBox type for 1 stack pointer sized heap allocated trait objects …

   Relevant commit messages from squashed history in order:
   
   Add initial version of ThinBox
   
   update test to actually capture failure
   
   swap to middle ptr impl based on matthieu-m's design
   
   Fix stack overflow in debug impl
   
   The previous version would take a `&ThinBox<T>` and deref it once, which
   resulted in a no-op and the same type, which it would then print causing
   an endless recursion. I've switched to calling `deref` by name to let
   method resolution handle deref the correct number of times.
   
   I've also updated the Drop impl for good measure since it seemed like it
   could be falling prey to the same bug, and I'll be adding some tests to
   verify that the drop is happening correctly.
   
   add test to verify drop is behaving
   
   add doc examples and remove unnecessary Pointee bounds
   
   ThinBox: use NonNull
   
   ThinBox: tests for size
   
   Apply suggestions from code review
   
   Co-authored-by: Alphyr <47725341+a1phyr@users.noreply.github.com>
   
   use handle_alloc_error and fix drop signature
   
   update niche and size tests
   
   add cfg for allocating APIs
   
   check null before calculating offset
   
   add test for zst and trial usage
   
   prevent optimizer induced ub in drop and cleanup metadata gathering
   
   account for arbitrary size and alignment metadata
   
   Thank you nika and thomcc!
   
   Update library/alloc/src/boxed/thin.rs
   
   Co-authored-by: Josh Triplett <josh@joshtriplett.org>
   
   Update library/alloc/src/boxed/thin.rs
   
   Co-authored-by: Josh Triplett <josh@joshtriplett.org>

   

   yaahc and joshtriplett committed Apr 8, 2022
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