ztop

[Mike McMahon <MMcM at MIT-AI>]

Obviously you view this according to a less conventional model.  ZTOP
mode is a read-eval-print loop implemented as a major mode, whereby it
reads input and prints to a buffer that receives typein in the normal
fashion.
It shouldn't be too hard to implement commands to simulate the other
features of your old thing; such as printing an evaluation value into
this buffer.  I don't understand what is useful about printing the
result of a compilation, unless what you really mean is that you want
the Compiler Warnings buffer to be in ZTOP mode, which is quite easy.