is duplicated by:

• SR-5921 Default constructor for structs with default values don't have argument with default value

relates to:

• SR-5714 Memberwise initializer should adopt struct access control

Issue Description:

Currently, if we don't have our own initializer for the structure, its default memberwise initializer allows to provide values of all properties. If we assign a default value for all of our properties, additional initializer in shape of init() becomes available to use.

It would be a lot more convenient to make structure initializer behave more like a function with default values.

Example:

struct S {
    var a: Int
    var b = 1
    var c: Int
}

var s1 = S(a: 0, c: 2)
var s2 = S(a: 10, b: 11, c: 12)

Are there any potential problems with such behavior?