extension Array: Equatable where Element==Int {}
swift-4.1.1-RELEASE
/usercode/main.swift:1:18: warning: conformance of 'Array<Element>' to protocol 'Equatable' was already stated in the type's module 'Swift' extension Array: Equatable where Element==Int {} ^ Swift.Array<Element>:1:11: note: 'Array<Element>' declares conformance to protocol 'Equatable' here extension Array : Equatable where Element : Equatable { ^