exit status: 1, error output:
main.swift:1:8: error: type 'S' does not conform to protocol 'Hashable' struct S: Hashable { ^ main.swift:1:8: error: type 'S' does not conform to protocol 'Equatable' struct S: Hashable { ^ Swift.==:2:13: note: candidate has non-matching type '<Element where Element : Equatable> (ContiguousArray<Element>, ContiguousArray<Element>) -> Bool' public func ==<Element>(lhs: ContiguousArray<Element>, rhs: ContiguousArray<Element>) -> Bool where Element : Equatable ^ Swift.==:2:13: note: candidate has non-matching type '<Element where Element : Equatable> (ArraySlice<Element>, ArraySlice<Element>) -> Bool' public func ==<Element>(lhs: ArraySlice<Element>, rhs: ArraySlice<Element>) -> Bool where Element : Equatable ^ Swift.==:2:13: note: candidate has non-matching type '<Element where Element : Equatable> (Array<Element>, Array<Element>) -> Bool' public func ==<Element>(lhs: [Element], rhs: [Element]) -> Bool where Element : Equatable ^ Swift.==:3:13: note: candidate has non-matching type '(Any.Type?, Any.Type?) -> Bool' public func ==(t0: Any.Type?, t1: Any.Type?) -> Bool ^ Swift.==:6:13: note: candidate has non-matching type '<T where T : RawRepresentable, T.RawValue : Equatable> (T, T) -> Bool' public func ==<T>(lhs: T, rhs: T) -> Bool where T : RawRepresentable, T.RawValue : Equatable ^ Swift.==:45:13: note: candidate has non-matching type '<T where T : Equatable> (T?, T?) -> Bool' public func ==<T>(lhs: T?, rhs: T?) -> Bool where T : Equatable ^ Swift.==:22:13: note: candidate has non-matching type '<T> (T?, _OptionalNilComparisonType) -> Bool' public func ==<T>(lhs: T?, rhs: _OptionalNilComparisonType) -> Bool ^ Swift.==:22:13: note: candidate has non-matching type '<T> (_OptionalNilComparisonType, T?) -> Bool' public func ==<T>(lhs: _OptionalNilComparisonType, rhs: T?) -> Bool ^ Swift.==:9:13: note: candidate