Growing a data type?

Hi,

Just watched Guy Steele's Growing a Language (http://video.google.com/
videoplay?docid=-8860158196198824415), very impressive.

Lisp got plus points for being able to abstract both abstract syntax
and function calls.

Here's a (hopefully) fun question: If Lisp didn't have a string data
type already, could you grow one which was indistinguishable from the
standard implementation, including double quote delimiters?

I don't expect this to be answered because I don't think I know any
language which can do this, but it would be nice to see how much of
string could be implemented in Lisp.
.

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