At 05:19 AM 2/20/97 -0500, you wrote:
>$ would then be context sensitive, because it's the standard to denote
>"current PC" as in
>        goto    $-1
>
>for an infinite loop.  I never liked making compilers with context-sensitive
>tokens myself.
>

Isn't an infinite loop done with:   goto   $

In your example, if the statement previous was some other goto, it might not be
infinite.  ie:    goto  $+2
                  goto  $-1

Sorry, I'm picking nits.