#28629: Q objects are no longer hashable in 2.0.
-------------------------------------+-------------------------------------
               Reporter:  coady      |          Owner:  nobody
                   Type:  Bug        |         Status:  new
              Component:  Database   |        Version:  2.0
  layer (models, ORM)                |
               Severity:  Normal     |       Keywords:  Q hash
           Triage Stage:             |      Has patch:  0
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 `tree.node` acquired an `__eq__` method, but not `__hash__`, making it an
 unhashable type.  This affects subclasses such as `Q`.

 My use case was having a mapping of `Q` objects to values.

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Ticket URL: <https://code.djangoproject.com/ticket/28629>
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