[MacPorts] #48708: elixir 1.0.5 not compatible with erlang 18

[MacPorts]

#48708: elixir 1.0.5 not compatible with erlang 18
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 Reporter:  rlonstein@…     |      Owner:  macports-tickets@…
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.3.3
 Keywords:  erlang, elixir  |       Port:  lang:elixir
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 See https://github.com/jeremyjh/dialyxir/issues/26 and https://github.com
 /elixir-lang/elixir/issues/3212.

 Can we version erlang into erlang17 and erlang18 and update this portfile
 to depend on erlang17 until the elixir 1.2 release.

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Ticket URL: <https://trac.macports.org/ticket/48708>
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