copyFromSlice method
Copies the elements from src into self. The length of src must be the same as this.
Implementation
void copyFromSlice(Slice<T> src) {
final length = len();
final srcLength = src.len();
if (length != srcLength) {
panic(
"Slices must be the same length, this is `$length` and src is `$src");
}
for (var i = src._start, j = _start; i < src._end; i++, j++) {
_list[j] = src._list[i];
}
}