[swift-users] Strange compilation error when calling required initializer on generic type parameter

[Christos Chryssochoidis]

Hi everyone,

I'm using the new Xcode 8/Swift 3 and I'm trying to figure out why the
first function in the snippet below compiles correctly, while the other one
does not.

import Foundation

import CoreData


protocol P {

    init?(i: Int)

}



class C {

    func f<T: NSObject>(i: Int) -> T? where T: P {

        return T(i: i)  // compiles OK

    }



    func g<T: NSManagedObject>(i: Int) -> T? where T: P {

        return T(i: i)  // doesn't compile: "Incorrect argument label in
call

                 ^      // (have: 'i:', expected 'context:')

    }

}


Is this some bug of the Swift compiler or am I missing something about
NSManagedObject being different in some way from other classes?

Thanks very much for any help on this.


– Christos
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