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Here is the lua program to reproduce this:

local function f()
  local x
  return function() return x end

local function g()
  local x
  return function() return x, y end


Both f and g return a lua closure with one upvalue (x).

However, lua 5.2 gives the following output on my machine:

table: 0x6000109c0
lua: env.lua:10: attempt to index a nil value (upvalue '_ENV')
stack traceback:
        env.lua:10: in function <env.lua:10>
        env.lua:14: in main chunk
        [C]: in ?

The table printed in the first line is actually _ENV, and not x.
The second print() throws an error, indicating that _ENV was set to nil.
I don't think either is the expected output, therefore I believe that this is a bug of lua implementation.
Lua 5.2 has this bug, and it is not fixed in 5.3 alpha/beta. I didn't test it with other versions.