.. efun:: int structp(mixed arg)

  Return 1 if :arg:`arg` is a struct.

  :history 3.3.273 introduced:

  .. seealso:: :efun:`baseof`, :efun:`closurep`, :efun:`floatp`, :efun:`mappingp`, :efun:`objectp`, :efun:`intp`, :efun:`referencep`, :efun:`pointerp`, :efun:`stringp`, :efun:`symbolp`, :efun:`clonep`