D7716: rust-discovery: partial switch to typestate pattern

[gracinet (Georges Racinet)]

gracinet added a comment.


  @martinvonz yes, I've thinked of it after I made this one, but somehow I thought this was enough for a first try.
  
  Yes, we could have `PartialDiscovery<Start>`,  and `PartialDiscovery<Computed>`, with  `Start` being a pure marker,  and `Computed` actually holding the undecided set and the children cache (anticipating on a later changeset), that would be more elegant and it would better organize the boiler plate.
  
  Don't hesitate if you come up with better namings.

REPOSITORY
  rHG Mercurial

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  https://phab.mercurial-scm.org/D7716/new/

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  https://phab.mercurial-scm.org/D7716

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