% engine=luatex

\usemodule[pre-30]

\StartSample{Basics}

\startbuffer
\lua { a = 1.5 ; b = 1.8 ; c = a*b ; tex.print(c) }

\startlua
    a = 1
    b = 2
    c = a*b
    tex.print(c)
\stoplua

\edef\luaversion{\lua{tex.print(_VERSION)}}

we use: \luaversion
\stopbuffer

\setups{show-usage}

\StopSample
