Open Radar

 
Summary:
In Swift, when you define a struct, an implicit constructor is created that takes all of the properties as arguments, e.g.:

struct Foo {
  var bar: Int
  var baz: Int

//  this constructor is created implicitly
//  init(bar: Int, baz: Int) {
//    self.bar = bar
//    self.baz = baz
//  }
}

It would be useful if, when the struct properties have been declared with default values, the equivalent arguments in the default constructor would be declared as being optional, like this:

struct Foo {
  var bar: Int = 5
  var baz: Int

//  this constructor is created implicitly
//  init(bar: Int = 5, baz: Int) {
//    self.bar = bar
//    self.baz = baz
//  }
}

that way, I could construct a Foo like this:

Foo(baz: 7)

And I wouldn't have to set bar because it already has a default value

Steps to Reproduce:
See description

Expected Results:
It should not be necessary to specify properties in the constructor if they already have default values

Actual Results:
Every property must be specified in the constructor