as.info: SubSection

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`.subsection NAME'

   This is one of the ELF section stack manipulation directives.  The
others are `.section' (*note Section::), `.pushsection' (*note
PushSection::), `.popsection' (*note PopSection::), and `.previous'
(*note Previous::).
   This directive replaces the current subsection with `name'.  The
current section is not changed.  The replaced subsection is put onto
the section stack in place of the then current top of stack subsection.