length_internal   205 src/fns.c          return length_internal (sequence, len) == -1? Qnil: Qt;
length_internal   220 src/fns.c          return length_internal (sequence, len + 1) == -1? Qt: Qnil;
length_internal   238 src/fns.c          return length_internal (sequence, len + 1) == 1? Qt: Qnil;