[MacPorts] #44584: [NEW] add a Cargo port

[MacPorts]

#44584: [NEW] add a Cargo port
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  Reporter:  macports.org@…  |      Owner:  macports-tickets@…
      Type:  request         |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:  rust
      Port:  cargo           |
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Comment (by g5pw@…):

 Now that rust is stable, I'll start working on a cargo port. I noticed it
 appears to have no versioning whatsoever.

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Ticket URL: <https://trac.macports.org/ticket/44584#comment:7>
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