tarunon

extension Sequence { public func compact<T>() -> [T] where Element == Optional<T> { return _compactMap { $0 } } } let b: [Int] = [] print(b.compact)

Version:

swift-4.1.1-RELEASE

Output:

Error:

/usercode/main.swift:7:9: error: generic parameter 'T' could not be inferred print(b.compact) ^