[MacPorts] #65011: cargo: 0.61.1 fails to build for 10.12 and earlier

[MacPorts]

#65011: cargo: 0.61.1 fails to build for 10.12 and earlier
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  Reporter:  mascguy  |      Owner:  herbygillot
      Type:  defect   |     Status:  assigned
  Priority:  High     |  Milestone:
 Component:  ports    |    Version:  2.7.2
Resolution:           |   Keywords:
      Port:  cargo    |
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Comment (by herbygillot):

 I think the only way we're going to avoid recurring issues like these is
 to make a concerted effort to provide a test matrix of all macOS versions
 for Github pull requests.  Either that, or some alternate testing branch
 that can run on the actual buildbots.

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Ticket URL: <https://trac.macports.org/ticket/65011#comment:1>
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