new bug

[Roberto Ierusalimschy <roberto@...>]

There is a new known bug that may affect all versions of Lua
since 5.2 [1].  The bug allows a simple-looking piece of code to crash
the pre-compiler, so it is particularly relevant for programs that
can run untrusted arbitrary code.

[1] https://www.lua.org/bugs.html#5.3.3

-- Roberto