Fixes UB in `stack::generator`: Aliasing violations and references to uninit memory.#19

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oliver-giersch wants to merge 3 commits intowhatisaphone:masterfrom oliver-giersch:master

+57-51

Commits on Mar 25, 2020

Replaces some instances of unsound code (UB) around uninitialized memory and aliasing of mutable references.
oliver-giersch
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fixes aliasing violation by splitting the mutable shelf borrow into a shared and a unique part
oliver-giersch
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replaces usage of ManuallyDrop in favor of self.future.as_mut().get_unchecked_mut()
oliver-giersch
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