// test array.getKeys() true => int passing; int a[0];string a_keys[0]; a.getKeys(a_keys); if (a_keys.size() != 0) {    <<< "key array should be empty" >>>;    false => passing;} float b[0];string b_keys[0];["key1", "key2"] @=> string b_want[]; 1 => b["key1"];2 => b["key2"]; b.getKeys(b_keys); checkKeys(b_keys, b_want) && passing => passing; vec3 c[0];string c_keys[0];["key2"] @=> string c_want[]; @(0,0,0) => c["key1"];@(0,0,1) => c["key2"];@(0,0,2) => c["key1"];@(0,0,3) => c["key1"];c.erase("key1"); c.getKeys(c_keys);checkKeys(c_keys, c_want) && passing => passing; string c_keys2[0];c.getKeys(c_keys2);checkKeys(c_keys2, c_want) && passing => passing; if (passing) <<< "success" >>>; fun int checkKeys(string got[], string want[]) {    if (got.size() != want.size()) {	printFailure(got, want);	return false;    }     true => int passing;    for (0 => int i; i < want.size(); i++) {	false => int contains;	for (0 => int j; j < got.size(); j++) {	    if (got[i] == want[j]) {		true => contains;	    }	} 	if (!contains) false => passing;    }     if (!passing) {	printFailure(got, want);	return false;    }    return true;} fun void printFailure(string got[], string want[]) {    <<< "failure in get_keys(), got:" >>>;    for (0 => int i; i < got.size(); i++) <<< got[i] >>>;    <<< "want:" >>>;    for (0 => int i; i < want.size(); i++) <<< want[i] >>>;}