ios - PromiseKit 2.0: chaining promises doesn't pass argument -

i have wrapped 2 of api requests promise<t> return types:

func registerwithemail(email: string, firstname: string, lastname: string, password: string, subscribe: bool) -> promise<bool>  func requestaccesstokenwithemail(username: string, password: string) -> promise<string> 

using them individually works fine:

firstly {     client.registerwithemail("foo@gmail.com", firstname: "john", lastname: "smith", password: "password", subscribe: false)     }.then { success -> void in         completion(success: success)     }.catch { error -> void in         println(error.localizeddescription) } 

and:

firstly {     client.requestaccesstokenwithemail("foo@gmail.com", password: "password")     }.then { accesstoken -> void in         println(accesstoken)         completion(success: true)     }.catch { error -> void in         println(error.localizeddescription) } 

however, when chain them, token argument second then call never populated:

firstly {     client.registerwithemail(username, firstname: "a", lastname: "b", password: password, subscribe: false).then { success -> void in         return client.requestaccesstokenwithemail(username, password: password)     }.then { accesstoken -> void in         println(accesstoken)         completion(success: true)     } } 

if break inside closure can't view accesstoken argument, outer completion closure. however, if break inside requestaccesstokenwithemail function, accesstoken argument populated when calling fulfill.

i'm quite new promisekit, please let me know if i'm doing stupid.

i'm using promisekit 2.0, swift 1.2, xcode 6.4

the problem signature of first then closure.

it success -> void needed success -> promise<string>

i thought would've been caught swift's type inference forgot then overloaded accept closures of both (t) -> promise<u> , (t) -> u.

hopefully when swift fixes need explicit signature in then closure automatically inferred.