[MacPorts] #59566: caf @0.17.2: error: constexpr constructor never produces a constant expression

[MacPorts]

#59566: caf @0.17.2: error: constexpr constructor never produces a constant
expression
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  Reporter:  ryandesign  |      Owner:  Schamschula
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  caf         |
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Comment (by ryandesign):

 [https://build.macports.org/builders/ports-10.10_x86_64-builder/builds/102187/steps
 /install-port/logs/stdio Still fails]. Maybe this is already a C++17
 feature they're using.

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Ticket URL: <https://trac.macports.org/ticket/59566#comment:3>
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