library test /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

static method test(core::List<core::int>? x) → dynamic {
  core::List<core::num> y = let final core::List<core::int>? #t1 = x in #t1 == null ?{core::List<core::num>} core::_GrowableList::•<core::num>(0) : #t1{core::List<core::int>};
}