[bug #63838] [tbl] doesn't warn if table entry ends with \z escape sequence

[G. Branden Robinson]

Update of bug #63838 (project groff):

                  Status:         Ready for Merge => Fixed                  
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:


commit 8209b72061ea7fb0380bdb42e6e68d80117aac7c
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat Feb 25 18:44:58 2023 -0600

    [tbl]: Fix Savannah #63838.
    
    * src/preproc/tbl/table.cpp (table::add_entry): Throw error diagnostic
      if table entry ends in the zero-motion escape sequence `\z`.  This is
      nonsense and provokes baffling diagnostics from the formatter.  Stick
      user's nose directly into the problem.
    
    Fixes <https://savannah.gnu.org/bugs/?63838>.  Thanks to the mandoc(1)
    project for documenting the issue in a regression test.
    
    Also annotate a null pointer with `nullptr` comment to ease any future
    transition to C++11, which defines it as a keyword.




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