From its earliest days, one of the selling points of Guile was that eventually it should be possible to use it to run Emacs Lisp. This is one of the reasons RMS

From its earliest days, one of the selling points of Guile was that eventually it should be possible to use it to run Emacs Lisp. This is one of the reasons RMS chose it as the GNU's official extension language. For some of the other reasons, google "Tcl war".