[MacPorts] #67597: Unable to upgrade rust to 1.70.0_0

[MacPorts]

#67597: Unable to upgrade rust to 1.70.0_0
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  Reporter:  RobK88  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect  |     Status:  accepted
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.8.1
Resolution:          |   Keywords:
      Port:  rust    |
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Comment (by RobK88):

 P.S.  I also do not know whet MacPorts insists on building `rust` from
 source, instead of downloading the prebuilt binaries.

 The only thing that I can see that is different in my build environment
 from the buildbot build environment is some of the dependencies needed to
 build `rust` on my Mac were built using the `+universal` variant.  Maybe
 that is the reason for the all the `rust` related issues on my Mac.

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Ticket URL: <https://trac.macports.org/ticket/67597#comment:9>
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