LINEREAD broken

[Dave Touretzky at CMU-10A]

LINEREAD under Tops-10 MacLisp generates ?ill mem refs.  Both the
compiled and the interpreted versions die.  Single stepping through the
interpreted version, it tried to do (RETURN (NREVERSE LIST-OF-FORMS)),
but when RETURN tried to return NIL I got blown out to the monitor by
the ill mem ref.

I tried this both in normal CMU MacLisp (with LINMODE set to T, and <cr>
setsyntaxed to act like <space>) and in a bare MacLisp with no init file.
Nothing helped.