-- This module implements {{anchor}}.  local getArgs = require('Module:Arguments').getArgs local tableTools = require('Module:TableTools')  local p = {}  function p.main(frame)  -- Get the positional arguments from #invoke, remove any nil values,  -- and pass them to p._main.  local args = getArgs(frame)  local argArray = tableTools.compressSparseArray(args)  return p._main(unpack(argArray)) end  function p._main(...)  -- Generate the list of anchors.  local anchors = {...}  local ret = {}  for _, anchor in ipairs(anchors) do  ret[#ret + 1] = '<span id="' .. anchor .. '"></span>'  end  return table.concat(ret) end  return p