>>>>> "M" == Massimiliano Mirra <list / NOSPAMchromatic-harp.com> writes:

M> What about just a[x,y,z]?

 a[x,y] is already defined

pigeon% ruby -e 'p [1,2,3,4][1,3]'
[2, 3, 4]
pigeon% 


Guy Decoux