[MacPorts] #48775: rust: update to 1.2.0

[MacPorts]

#48775: rust: update to 1.2.0
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  Reporter:  sean@…  |      Owner:  g5pw@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.3.3
Resolution:          |   Keywords:  haspatch
      Port:          |
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Comment (by sean@…):

 Ok, I finally cracked this. Thanks for the comment about the internet
 connection. That got me to figure out how to get a new stage0.

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Ticket URL: <https://trac.macports.org/ticket/48775#comment:4>
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