Update to nightly-2020-12-07

[TimDiekmann]

Implements rust-lang/rust#79286

[codecov-io]

Codecov Report

Merging #2 (a5cd3cc) into main (6f1ffaf) will decrease coverage by 0.46%.
The diff coverage is 84.91%.

@@            Coverage Diff             @@
##             main       #2      +/-   ##
==========================================
- Coverage   87.34%   86.89%   -0.46%     
==========================================
  Files           5        4       -1     
  Lines          79       61      -18     
  Branches        4        3       -1     
==========================================
- Hits           69       53      -16     
+ Misses          8        7       -1     
+ Partials        2        1       -1     

Impacted Files	Coverage Δ
src/lib.rs	100.00% <ø> (ø)
src/buffer/alloc.rs	76.47% <76.47%> (ø)
src/boxed/mod.rs	100.00% <100.00%> (+4.55%)	⬆️
src/boxed/raw.rs	100.00% <100.00%> (ø)

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