[MacPorts] #38663: rust @0.5: update to 0.6

[MacPorts]

#38663: rust @0.5: update to 0.6
---------------------+--------------------------------
 Reporter:  egall@…  |      Owner:  macports-tickets@…
     Type:  update   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.1.3
 Keywords:           |       Port:  rust
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 https://mail.mozilla.org/pipermail/rust-dev/2013-April/003427.html
 {{{
 gl00b05044:~ root# port -v livecheck rust
 rust seems to have been updated (port version: 0.5, new version: 0.6)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/38663>
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