$ make; cd src

Then do the following for each symbol:
                - setf
                - find-file
                - with-current-buffer
                - buffer-file-name

    $ ./emacs -Q -batch -l test.el -eval '(foo (quote setf))'
    [1] "setf"
    [2] "sxtf"

    $ ./emacs -Q -batch -l test.el -eval '(foo (quote find-file))'
    [1] "find-file"
    [2] "fxnd-file"

And these below below: aref, null, car, cdr, save-current-buffer

    $ ./emacs -Q -batch -l test.el -eval '(foo (quote aref))'
    [1] "aref"
    Fatal error 11: Segmentation fault
    Backtrace:
    ...

My observation is that symbols "introduced" via C defuns and defmacros
exhibit this problem, whereas those introduced via Elisp defuns and
defmacros do not.  No symbols introduced via defvars exhibit this
problem, as shown above with buffer-file-name.

Seeing that it is a segfault, maybe the setf is trying to modify
readonly memory produced by the C defuns and defmacros?  If that is the
case, *if* we allow such modifications, we should make the memory
readwrite; *otherwise* maybe we should no-op, warn, or err in setf and
friends when we see readonly memory blocks?

With this collection of GDB commands: