Closed upvalues not supported =(

[mpeterv]

local u = "Hello"

local function f()
   local w = "World"
   return function()
      print(u .. " " .. w)
      print(F"{u} {w}")
   end
end

f()()

Hello World
Hello nil

[mpeterv]

If w is not used in the inner function then its value dies after f returns, otherwise debug.getupvalue should help.

[hishamhm]

This example now works, thank you!