I don't think about it as a general "previous expression" thing. It's just a special modifier for the indexing operation to tell it, unambigously, to count relative to the end of the array/string.
I haven't yet thought about how to map it to `[] calls.
/ Niels Möller (med röd bil)
Previous text:
2003-05-15 22:35: Subject: Negative ranges revisited
I think that represent-the-previous-expression is very nice syntactically. But how would it work internally?
/ Mirar