[swift-users] Why this can't compile

[boris]

import Cocoa

var numbers = [12, 14, 15, 21]

// This is OK
numbers.map({
    (number:Int) -> Int in
        let result = 3 * number
        return result
})


// This is OK
numbers.map({
    (number: Int) in
        return 3 * number

})

//Report Error: Ambiguous reference to member ‘map’ 
//    
numbers.map({
    (number: Int) in
        var ret = 3 * number
        return ret
})

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