[MacPorts] #63834: legacy-support: can't read "ls_cache_incpath": no such variable

[MacPorts]

#63834: legacy-support: can't read "ls_cache_incpath": no such variable
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  Reporter:  ryandesign                |      Owner:  cjones051073
      Type:  defect                    |     Status:  assigned
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:  2.7.1
Resolution:                            |   Keywords:
      Port:  mercurial legacy-support  |
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Comment (by ryandesign):

 But mercurial only needs cargo_fetch in the rust variant. The cargo_fetch
 portgroup does a bunch things immediately when it's included. Will that
 mess up the mercurial port when the rust variant is not selected?

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Ticket URL: <https://trac.macports.org/ticket/63834#comment:8>
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