[MacPorts] #39637: rust @0.6: update to 0.7

[MacPorts]

#39637: rust @0.6: update to 0.7
---------------------+--------------------------------
 Reporter:  egall@…  |      Owner:  macports-tickets@…
     Type:  update   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  rust
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 https://mail.mozilla.org/pipermail/rust-dev/2013-July/004667.html

 Also livecheck confirms:
 {{{
 Local-Admins-MacBook-Pro:~ root# port -v livecheck rust
 rust seems to have been updated (port version: 0.6, new version: 0.7)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/39637>
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