[MacPorts] #39113: 'port -f clean --all all' aborts with unintelligible error

[MacPorts]

#39113: 'port -f clean --all all' aborts with unintelligible error
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  Reporter:  istlota@…  |      Owner:  macports-tickets@…
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.1.3
Resolution:             |   Keywords:
      Port:             |
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Comment (by istlota@…):

 Replying to [comment:2 ryandesign@…]:
 > According to the output, drush was successfully cleaned; it would be the
 port after drush: drwright. Does the problem always happen at the same
 port? Are the flags `-f` and `--all` necessary to reproduce the problem?
 Does just `sudo port clean drwright` produce the same error?

 Thanks. 'sudo port clean drwright' fixed the problem. For future
 reference, where can I find a list of ports in the order that 'port clean'
 cleans them?

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Ticket URL: <https://trac.macports.org/ticket/39113#comment:3>
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