$ cat file.rst
Cite many times the same item [ABCDEF]_ [ABCDEF]_ is okay.
.. [ABCDEF] bibliography
Many times the same item [XYZ]_ in bibliography in the same file is not
.. [XYZ] bibliography1
.. [XYZ] bibliography2
labbe@priminfo tmp $ rst2html file.rst file.html
file.rst:9: (WARNING/2) Duplicate explicit target name: "xyz".
file.rst:6: (ERROR/3) Duplicate target name, cannot be used as a unique
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