[MacPorts] #65257: rust: large volume of compilation warnings, pollutes build log

[MacPorts]

#65257: rust: large volume of compilation warnings, pollutes build log
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 Reporter:  mascguy  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.2
 Keywords:           |       Port:  rust
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 Presently there appear to be very large number of warnings during
 compilation of `rust`, making it difficult to discern what's important.
 (Not to mention causing the build logs to be massive.)

 Attached is an example, for a build on 10.13.

 It might be helpful to reduce these to the bare minimum - or perhaps even
 eliminate them entirely, if necessary - so that the logs are more
 manageable.

 If the consensus is that such warnings are critical to leave in place,
 then so be it. But if folks don't have a preference, reducing the
 verbosity could be beneficial.

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Ticket URL: <https://trac.macports.org/ticket/65257>
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