gistfile1.txt

do
  local function _ffa(func,key)
    local nextv
    key,nextv = next(_G,key)
    while nextv ~= nil do
      if nextv == func then
        return key,_ffa(func,key)
      end
      key,nextv = next(_G,key)
    end
  end
  
  function findfuncall(func)
    return _ffa(func,nil)
  end
end