duplicates:

• SR-488 Crash when emitting store into a generic member, from initializer in an extension

relates to:

• SR-488 Crash when emitting store into a generic member, from initializer in an extension

Issue Description:

Sample code (crashing) :

struct L<Element> {
    var l1: Element?
}

extension L: ArrayLiteralConvertible {
    init(arrayLiteral elements: Element...) {
        l1 = elements.first!
    }
}

I tested a lot of cases and after trial and error found workarounds:

• if l1 is a let instead of a var, compilation succeeds

• if the base constructor is called, compilation succeeds

Best workaround - call base constructor :

Working

struct L<Element> {
    var l1: Element?
}

extension L: ArrayLiteralConvertible {
    init(arrayLiteral elements: Element...) {
        self.init(l1: elements.first!)
    }
}

Thanks for the good work