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Add MaybeUninit::assume_init_drop. #76484
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  Sep 12, 2020 
      
    
                
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            Add MaybeUninit::assume_init_drop. #76484
                    bors
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    ManuallyDrop's documentation tells the user to use MaybeUninit instead when handling uninitialized data. However, the main functionality of ManuallyDrop (drop) was not available directly on MaybeUninit. Adding it makes it easier to switch from one to the other.
| r? @RalfJung | 
              
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| This is perfect. :) @bors r+ rollup | 
| 📌 Commit 43c7a9b has been approved by  | 
    
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…it-drop, r=RalfJung Add MaybeUninit::assume_init_drop. `ManuallyDrop`'s documentation tells the user to use `MaybeUninit` instead when handling uninitialized data. However, the main functionality of `ManuallyDrop` (`drop`) is not available directly on `MaybeUninit`. Adding it makes it easier to switch from one to the other. I re-used the `maybe_uninit_extra` feature and tracking issue number (rust-lang#63567), since it seems very related. (And to avoid creating too many features tracking issues for `MaybeUninit`.)
    
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Rollup of 7 pull requests Successful merges: - rust-lang#76114 (Add saturating methods for `Duration`) - rust-lang#76297 (rustdoc: fix min_const_generics with ty::Param) - rust-lang#76484 (Add MaybeUninit::assume_init_drop.) - rust-lang#76530 (Eliminate mut reference UB in Drop impl for Rc<T>) - rust-lang#76583 (Update `std::os` module documentation.) - rust-lang#76599 (Finish off revisions for const generics UI tests.) - rust-lang#76615 (Add missing examples on binary core traits) Failed merges: r? `@ghost`
  
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      Labels
      
    A-raw-pointers
  Area: raw pointers, MaybeUninit, NonNull 
  
    S-waiting-on-bors
  Status: Waiting on bors to run and complete tests. Bors will change the label on completion. 
  
    T-libs-api
  Relevant to the library API team, which will review and decide on the PR/issue. 
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ManuallyDrop's documentation tells the user to useMaybeUninitinstead when handling uninitialized data. However, the main functionality ofManuallyDrop(drop) is not available directly onMaybeUninit. Adding it makes it easier to switch from one to the other.I re-used the
maybe_uninit_extrafeature and tracking issue number (#63567), since it seems very related. (And to avoid creating too many features tracking issues forMaybeUninit.)