[MacPorts] #40616: rust @0.7_0: update to 0.8

[MacPorts]

#40616: rust @0.7_0: update to 0.8
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  Reporter:  macports.org@…  |      Owner:  larryv@…
      Type:  update          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  rust            |
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Comment (by larryv@…):

 Replying to [comment:2 g5pw@…]:
 > Larry, I sent you a patch that builds fine for me, have you tried it?

 I have some similar changes that build okay, but there are a couple of
 additional changes that I want to make.

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Ticket URL: <https://trac.macports.org/ticket/40616#comment:3>
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