defer is not defined

The ‘defer’ keyword is used in one example of the specification. I had to lookup its meaning in Swift. I’m assuming it has the same behavior in Hylo.

Locate the specification example that uses the “defer” keyword and read the surrounding section to determine what behavior needs explanation. Document the keyword’s meaning and clarify whether Hylo matches Swift’s behavior; the issue is done when a reader can understand the example without looking up Swift.

Written by the indexing model from the issue text.