Xcode-beta (7A165t): [Swift] Structs fail protocol conformity when a property is implemented as a lazy stored property

Originator:david.ndh
Number:rdar://21966810 Date Originated:23-Jul-2015 08:20 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode-beta (7A165t)
Classification:Other Bug Reproducible:Always
 
Summary:
Structs that conform to a certain protocol should be able to implement properties as lazy stored properties without breaking protocol conformity.

Steps to Reproduce:
1. Declare this

protocol R {
	var name: String { get }
}

struct A: R {
	lazy var name: String = {
		return "John Doe"
		}()
}

Expected Results:
Type ’A’ conforms to protocol ‘R’.

Actual Results:
Type ’A’ does not conform to protocol ‘R’.

Regression:
N.A.

Notes:
This only applies to Structs, Classes can implement properties as lazy stored properties without breaking protocol conformity.

Comments

I've noticed a similar issue when the protocol declares a function and the struct implements it as being mutating.

You can check this code:

protocol R { 

var name: String { get }

func randomName()

}

struct A: R { 

var name: String

mutating func randomName() {
    self.name = "Eddy Cue"
}

}

By david.ndh at July 23, 2015, 9:16 p.m. (reply...)

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