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Issue Description:

When I try to call the generic function below, if I pass the wrong type for the second parameter (a String instead of an Int), the compile error is wrong. It says there is a problem with the first parameter.

The error is:
Key path value type 'Equipment?' cannot be converted to contextual type 'NSManagedObject?'

I think the error should be something like:
Cannot convert value of type 'String' to expected argument of type 'Int'

Here is the code (sorry if the formatting is wrong, there is also a playground attached):

import CoreData``class

Equipment: NSManagedObject {

{{}}}

class Injury {

{{ init() {}}

    }

{{ var equipment: Equipment?}}

{{ func set<T: NSManagedObject>(propertyAt keyPath: ReferenceWritableKeyPath<Injury, T?>, toValueWithServerID serverID: Int {}}

    }  

{{}}}

let injury = Injury()

injury.set(propertyAt: \Injury.equipment, toValueWithServerID: "foo")