ZTOP mode is worthless!

[Moon at MIT-AI (David A. Moon)]

In the version of zwei on system 30.4, with microcode 671, on LISP Machine Six:

I was typing in a function into a ztop buffer, hoping to take advantage of all
the nice editor features for typing in my temporary hack function.  Wanting to
test something before I finished writing it, I went to the end of the buffer and
typed in a form.  Not only did it not evaluate that form, but rather evaluate something
random out of the middle of my partially typed defun and get an error, but it lost
all the stuff I had typed in.