exit status: 1 with stderr:
<stdin>:6:56: error: expected '{' to start setter definition subscript(idx: Set<Element>.Index) -> Element { set[idx] } ^ <stdin>:7:45: error: expected '{' to start setter definition var startIndex: Set<Element>.Index { set.startIndex } ^ <stdin>:8:43: error: expected '{' to start setter definition var endIndex: Set<Element>.Index { set.endIndex } ^
(edited)