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`.tag STRUCTNAME'
=================

   This directive is generated by compilers to include auxiliary
debugging information in the symbol table.  It is only permitted inside
`.def'/`.endef' pairs.  Tags are used to link structure definitions in
the symbol table with instances of those structures.

   `.tag' is only used when generating COFF format output; when `as' is
generating `b.out', it accepts this directive but ignores it.