For structs, i.e.`MKMapPoint` or `CGPoint`, Apple Help contains initializers, available in Swift only. Example: https://take.ms/zd3Fp
These are so called memberwise initializers.
I.e. For a struct `CGPoint` having `x` and `y` fields, Swift automatically generates a memberwise initializer.
For each of such initializers, we need a mapping added to StructInitializers.def: