  5| part of "dart:core";
107| @pragma('vm:entry-point')
108| abstract final class String implements Comparable<String>, Pattern {
743| }
781| final class Runes extends Iterable<int> {
804| }
807| bool _isLeadSurrogate(int code) => (code & 0xFC00) == 0xD800;
810| bool _isTrailSurrogate(int code) => (code & 0xFC00) == 0xDC00;
813| int _combineSurrogatePair(int start, int end) {
815| }
818| final class RuneIterator implements Iterator<int> {
978| }