///
////function apply(source: T[], selector: (x: T) => U) {
//// var /*1*/xs = source.map(selector); // any[]
//// var /*2*/xs2 = source.map((x: T, a, b): U => { return null }); // any[]
////}
goTo.marker('1');
verify.quickInfoIs('(local var) xs: U[]');
goTo.marker('2');
verify.quickInfoIs('(local var) xs2: U[]');