#20601: Issue @experimental warnings only once
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       Reporter:  jsrn               |        Owner:
           Type:  defect             |       Status:  needs_review
       Priority:  major              |    Milestone:  sage-7.3
      Component:  misc               |   Resolution:
       Keywords:  warnings,          |    Merged in:
  experimental                       |    Reviewers:
        Authors:  Johan S. R.        |  Work issues:
  Nielsen                            |       Commit:
Report Upstream:  N/A                |  5c288220006c7d1edd93594b0b20ac6dbedfe6eb
         Branch:                     |     Stopgaps:
  u/jsrn/20601_experimental          |
   Dependencies:                     |
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Comment (by jsrn):

 I managed to make a test that properly demonstrates the behaviour: without
 the patch, the test fails since extra `FutureWarning`s are issued, while
 the test passes with the patch.

 Due to aforementioned Sphinx magic the test is a bit complicated: it seems
 the test has to involve a "real" function/class and span multiple
 documentation strings, so I've added a class `__experimental_self_test`
 for this purpose.

 Note that this behaviour is really critical, i.e. that only a single
 warning is issued across documentation strings: if not, a class that is
 marked as `@experimental` would need to add the `FutureWarning` to *all*
 documentation strings in the entire file. With this patch, only a single
 at the top needs to be added (e.g. together with the documentation text
 that describes that the functionality is experimental).

 The patch is still in needs review.

--
Ticket URL: <http://trac.sagemath.org/ticket/20601#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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