[MacPorts] #60194: rust at 1.42.0: ld: symbol(s) not found for architecture x86_64

[MacPorts]

#60194: rust at 1.42.0: ld: symbol(s) not found for architecture x86_64
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  Reporter:  nasyxx  |      Owner:  g5pw
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.99
Resolution:          |   Keywords:
      Port:  rust    |
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Comment (by nasyxx):

 Hi, today, I rebuild `llvm-9.0` without `+ocaml`.  And now `rust` can
 upgrade successfully.

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Ticket URL: <https://trac.macports.org/ticket/60194#comment:6>
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