[FUN] Codegolf: Lua 5.3-only program

[Egor Skriptunoff <egor.skriptunoff@...>]

Hi!

The task: write a Lua program which runs only on Lua 5.3.

It should not run under other Lua versions (5.1, 5.2, 5.4, LuaJIT):

either a compile-time or a run-time error should occur.

For example, the following program is Lua 5.3-only and its length is 41 bytes:
if _VERSION~="Lua 5.3" then error("") end

This is a codegolf: the shortest Lua 5.3-only program wins.