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    \$\begingroup\$ Does _ENV=5 work? If so, it's one character shorter. \$\endgroup\$
    – Stack Exchange Supports Israel
    Commented Oct 22, 2015 at 0:54
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    \$\begingroup\$ @immibis True, but this is a popularity contest, not a code length contest. PS - Trust you to home in on the Lua answer. \$\endgroup\$
    – Pharap
    Commented Oct 22, 2015 at 1:08
  • \$\begingroup\$ +1 for Lua. Doesn't $_G=nil$ do more or less the same as well? \$\endgroup\$
    – Doddy
    Commented Oct 23, 2015 at 7:19
  • \$\begingroup\$ @Doddy Nope, because _G is just a copy of _ENV you can use to look up variables and stuff like that - it isn't actually the environment. You could, however, do _G=nil and then set the environment to _G, and that would have the same effect. \$\endgroup\$
    – Nico A
    Commented Oct 23, 2015 at 10:48
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    \$\begingroup\$ Not entirely true. If you have a backup somewhere in local variable, you can restore it. And you can still define local variables and even call string-related functions! \$\endgroup\$
    – val - disappointed in SE
    Commented Jun 10, 2019 at 19:57