gistfile1.txt

    func then<NT,NE>(onFulfilled:(T) -> Promise<NT,NE>) -> Promise<NT,NE> {
        var p =  Promise<NT,NE>()
        switch self.state.state {
        case .Rejected:
            p.reject(self.state.error) // this is a type error
        case .Fulfilled:
            let result = onFulfilled(self.state.value!)
            result.then( { p.fulfill($0) })
            result.catch( {p.reject($0) })
        case .Pending:
            fHandlers.append({ (t:T) in
                let res = onFulfilled(t)
                res.then({ p.fulfill($0) })
                res.catch({ p.reject($0) })
            })
        }

        return p
    }