[MacPorts] #50518: bug: case sensitive port names in boolean expressions

[MacPorts]

#50518: bug: case sensitive port names in boolean expressions
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  Reporter:  mojca   |      Owner:  neverpanic
      Type:  defect  |     Status:  accepted
  Priority:  Normal  |  Milestone:  MacPorts 2.5.0
 Component:  base    |    Version:  2.3.4
Resolution:          |   Keywords:
      Port:          |
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Comment (by ryandesign):

 Does anybody know where in MacPorts base these Boolean expressions are
 handled? Trying to search base for "and" or "or" has been pretty futile.

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Ticket URL: <https://trac.macports.org/ticket/50518#comment:5>
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