"Computed gotos" not tested

[jkeenan]

As part of my research on Fatalization of currently deprecated goto
construct I have been
re-reading our current documentation of goto in blead and have been trying
to locate in our test suite examples of each claim made in that documentation.
What we find -- or fail to find -- there will have an impact on the
documentation updates provided as part of a pull request like the current
#23782. I've posted the preliminary results
of that documentation review
here.

This is the third in a series of GH issues addressing the items which I
believe are lacking in that documentation.

perldoc -f goto states that goto:

If the expression [in "goto EXPRESSION"] evaluates to a label name, its scope will be
resolved dynamically.  This allows for computed "goto"s per
FORTRAN, but isn't necessarily recommended if you're optimizing
for maintainability:

    goto ("FOO", "BAR", "GLARCH")[$i];

This code example also appears in pod/perlsyn.pod. I can't find an actual
instance of such code anywhere in the Perl 5 test suite. Provide some
examples in tests.

[tonycoz]

t/op/goto.t does do some goto EXPRESSION testing, though it doesn't test that specific case.

search for goto $

[jkeenan]

t/op/goto.t does do some goto EXPRESSION testing, though it doesn't test that specific case.

search for goto $

Thanks. I will self-assign this ticket for the purpose of making sure that the tests you are citing are also found in the branch being developed in #23782 (though I won't get to that task until next week).