Indentation and optional delimiters

[bearophileHUGS at lycos.com]

castiro... at gmail.com:
> Why not b = copyonwrite( a )?
> Subclass the interpreter-- make your own session.

Your idea may work, but I am talking about a new language (with some
small differences, not a revolution). Making such language efficient
enough may require to add some complex tricks, copy-on-write is just
one of them, a JIT is probably useful, etc.

Thank you, bye,
bearophile