length_internal   206 src/fns.c          return length_internal (sequence, len) == -1? Qnil: Qt;
length_internal   221 src/fns.c          return length_internal (sequence, len + 1) == -1? Qt: Qnil;
length_internal   239 src/fns.c          return length_internal (sequence, len + 1) == 1? Qt: Qnil;