D7522: rust-dirs: handle forgotten `Result`s

[durin42 (Augie Fackler)]

durin42 added a comment.
durin42 resigned from this revision.


  This needs a rebase that I'm not sure I can accomplish correctly. Could you take a look?

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7522/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7522

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Cc: durin42, kevincox, mercurial-devel