[MacPorts] #38289: rust @0.5: upstream only supports newer compilers

[MacPorts]

#38289: rust @0.5: upstream only supports newer compilers
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  Reporter:  larryv@…  |      Owner:  g5pw@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.1.3
Resolution:            |   Keywords:
      Port:  rust      |
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Comment (by egall@…):

 r103858 worked towards fixing this. Also r103863 and r103864 and r103870
 in larryv's sandbox will help fix this once they are merged back into
 trunk.

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Ticket URL: <https://trac.macports.org/ticket/38289#comment:1>
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