[Bug libstdc++/124539] New: Unimplemented rules for chrono::tzdb parsing of tzdata.zi file

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124539

            Bug ID: 124539
           Summary: Unimplemented rules for chrono::tzdb parsing of
                    tzdata.zi file
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

There are some rules in the zic(8) man page which we don't implement correctly
(or at all).