DefaultIndices<AnyCollection<Int>>(_elements: Swift.AnyCollection<Swift.Int>(_box: Swift._RandomAccessCollectionBox<Swift.Array<Swift.Int>>), _startIndex: (), _endIndex: ())

stderr:

warning: the Swift runtime was unable to demangle the type of field '_startIndex'. the mangled type name is '5IndexSlQz'. this field will show up as an empty tuple in Mirrors warning: the Swift runtime was unable to demangle the type of field '_endIndex'. the mangled type name is '5IndexSlQz'. this field will show up as an empty tuple in Mirrors