The First Lisp Compiler
> In LISP 1.5, function definitions were stored on the property list of the function's name...<p>The fact that this was once the norm but has since been done away with saddens me. I've always been fascinated with "live environments" but felt they only went half way if they didn't include the source code itself. If I'm going to be updating something in a running system, I want to know what source code was used to get the system to the state its currently in, and preferably be able to query that source code as data. Of course, that code could be kept within source control, but then it's a shadow of the running system -- a map of the territory and not the territory.<p>As far as I know, the only languages/environments where this functionality is still available are Tcl, Smalltalk, and to some extent stored procedures within an RDBMS.