[swift-evolution] [proposal] Allow convenience initializers to use "self = Foo()"

[Charles Constant]

Does anyone else think we should allow assignment to self in Class
"convenience init" methods?

Ie: this is legal for a struct, but complains about self being immutable if
you try it in a Class, even if it's a convenience init:

    init( foo:String ){
        self = Me( bar:foo )
    }

I haven't seen this proposed so far, but is there even a reason why can't?

I've run into headaches with this a couple times lately. Specifically,
where the appropriate construct for my code seemed to be an init, but I
didn't have access to the desired required init, only a class function.
It's also confusing if you decide to change some Type from a struct to a
class, to find you have to turn an init into a static function.
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