bset_major_mode  1091 src/buffer.c     bset_major_mode (b, Qfundamental_mode);
bset_major_mode  4634 src/buffer.c     bset_major_mode (&buffer_local_flags, make_fixnum (-1));
bset_major_mode  4826 src/buffer.c     bset_major_mode (&buffer_defaults, Qfundamental_mode);