Pari/GP has introduced lightweight anonymous function syntax

[Dirk Laurie <dirk.laurie@...>]

We haven't opened this can of worms recently :-)

Pari/GP is a language with these features in common with Lua:
  it has several types which at the C level looks like one type,
  it is implemented as a library,
  it comes with its own scripting language.

The basic function definition syntax was not heavy to start with:

   f(a,b,c)=a*(b-c)

but in Pari 2.5 anonymous syntax was introduced:

   f=(a,b,c)->a*(b-c)

I'm not saying Lua should do it this way, I'm just relaying the info.