Mara Bos 29fad213b2
Rollup merge of #78735 - danielhenrymantilla:simplify-unsafecell-getmut, r=RalfJung
Simplify the implementation of `get_mut` (no unsafe)

Quick PR to reduce one use of `unsafe` pointed out in the previous PR

r? ````@RalfJung````
2020-11-05 10:29:54 +01:00
..
2020-11-05 12:57:18 +09:00