type inference failing on closures

shorthand args

// this compiles:
    private func loadMessages() {
        getMsgList(self.auth).map() { (listRes:Result<MsgList>) -> Void in
            switch(listRes) {
            case let .Value(v):
                die("swift needs type holes",43)
            case let .Error(e): die("ERROR getting msgres: \(e)", 6)
            }
            return
        }
    }

// This fails with:
// Cannot convert the expression's type '(($T8) -> ($T8) -> $T7) -> (($T8) -> $T7) -> $T7' to type 'B'
    private func loadMessages() {
        getMsgList(self.auth).map() {
            switch($0) {
            case let .Value(v):
                die("swift needs type holes",43)
            case let .Error(e): die("ERROR getting msgres: \(e)", 6)
            }
            return
        }
    }
    
// same failure as above
    private func loadMessages() {
        getMsgList(self.auth).map() { a in
            switch(a) {
            case let .Value(v):
                die("swift needs type holes",43)
            case let .Error(e): die("ERROR getting msgres: \(e)", 6)
            }
            return
        }
    }