Do we need to support a syntax like this?

x<-x+2

x<--1

Or only with legal in space-between:

x <- x + 2

x <- -1

I think they are definitely legal statements. Maybe the only illegal ones are:

function <- 1

or

print <- 1

Because both print and function are reserved keywords, they are not supposed to be used as variable name.

Hi, your question is answered here:

https://secure.csse.uwa.edu.au/run/help2002?p=np&opt=U145