test

local function copyTable(...)
    local tArgs={...}
    local rtrn = {}
    local tbl = tArgs[1]
    if not type(tbl) == "table" then
        error("Argument 1 must be a table!")
    end
    local copied = tArgs[2] or {}
    for k, v in pairs(tArgs[1]) do
        if copied[tostring(k)] == nil then
            if type(tbl[k]) == "table" then
                copied[tostring(k)] = true
                rtrn[k] = copyTable(tbl[k], copied)
            else
                rtrn[k] = v
                copied[tostring(k)] = true
            end
        end
    end
    return rtrn
end
_G.myENV = copyTable(_ENV)
_G.myENV.fs.copy = function() error(true) end
_G.myENV.fs.copy()