This was (is?) a step in compiling Emacs. Compile the C code into an uninitialized binary of the Lisp interpreter, start the interpreter, load in a bunch of Lis

This was (is?) a step in compiling Emacs. Compile the C code into an uninitialized binary of the Lisp interpreter, start the interpreter, load in a bunch of Lisp code, dump core, then undump the core into /usr/bin/emacs.