I think you are right on ` lifetime guaranteed to be around until the
method call completes`. But`[unowned self]` released the retain manually in
your code. Just removing `[unowned self]` part, you code will work.
Zhaoxin
On Wed, Feb 22, 2017 at 3:18 AM, Marco S Hyman via swift-users <
swift-users@swift.org> wrote:
> > The following code crashes:
> >
> > class Demo {
> > var value = 0
> > lazy var increment: (Int) -> Void = { [unowned self] by in
> > self.value += by
> > print(self.value)
> > }
> > }
> >
> > Demo().increment(3)
> > error: Playground execution aborted: error: Execution was interrupted,
> reason: EXC_BREAKPOINT (code=EXC_I386_BPT, subcode=0x0).
>
> value is not a static/class variable. Without an instance of Demo it
> does not exist. This seems to work.
>
> class Demo {
> static var value = 0
> lazy var increment: (Int) -> Void = { [unowned self] by in
> value += by
> print(value)
> }
> }
>
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