[MacPorts] #15186: port upgrade does not work correctly on current pseudo-port

[MacPorts]

#15186: port upgrade does not work correctly on current pseudo-port
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  Reporter:  raimue  |      Owner:  raimue
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:  MacPorts 2.5.0
 Component:  base    |    Version:  1.6.0
Resolution:          |   Keywords:  base upgrade
      Port:          |
---------------------+----------------------------
Changes (by neverpanic):

 * status:  new => assigned
 * owner:  macports-tickets@… => raimue
 * milestone:  MacPorts Future => MacPorts 2.5.0


Comment:

 We should probably just remove the possibility to run `upgrade` with the
 `current` port. This is a very uncommon usecase otherwise, so it's
 probably not worth investing a lot of time into it.

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Ticket URL: <https://trac.macports.org/ticket/15186#comment:4>
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