D6597: rust-2018: switch hg-core and hg-cpython to rust 2018 edition

[Alphare (Raphaël Gomès)]

Alphare added a comment.


  In D6597#96881 <https://phab.mercurial-scm.org/D6597#96881>, @kevincox wrote:
  
  > Is the SliceExt change related to the 2018 change? If not could you split the two?
  
  It is indeed related to 2018: `mod.rs` files are not needed anymore and this makes it both simpler in terms of file structure, but also for development, as having 5 `mod.rs` files open is not fun.

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  https://phab.mercurial-scm.org/D6597/new/

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  https://phab.mercurial-scm.org/D6597

To: Alphare, #hg-reviewers, kevincox
Cc: pulkit, durin42, kevincox, mercurial-devel