[SR-6245] Deinit gets invoked on never-initialised object

[iby]

Previous ID	SR-6245
Radar	None
Original Reporter	@iby
Type	Bug
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s
Labels	Bug
Assignee	None
Priority	Medium

md5: 8123dfa5867b9577ae49cfb6f245273e

Issue Description:

Consider the following:

class Foo
{
    init(x: UnsafeMutablePointer<Int>) {
        self.x = x
    }

    deinit {
        Swift.print("Oh boy…", self.x)
    }

    var x: UnsafeMutablePointer<Int>
}

class Bar: Foo
{
    init?(p: Int?) throws {
        if p == nil {
            Swift.print("Erroring…")
            throw E.any
        }
        var x: Int = 1
        super.init(x: &x)
    }

    convenience init?() throws {
        try self.init(p: nil)
    }
}

enum E: Error
{
    case any
}

_ = try? Bar()

It outputs:

[slavapestov]

I fixed this in #12454