You're not going to have the language redefined after all these years. Depending on what you want to do, there may be some other constructs which achieve what you want.
//echo -a $eval($1,0) and $ $+ 1 and $!1
//var -sp %var abc $+ $chr(32) | var -s %a $gettok(sha1 sha256,$r(1,1),32) | echo -a $qt(%var) -> $($+($,%a,$chr(40),$eval(%var,0),$chr(44),0,$chr(41)),2) and $sha1(abc $+ $chr(32)) and $sha1(%var)
