pub const TRY: &str = "try";Expand description
try: block — run the block and reify a failure as a Result[T, E].
The handler is a form, so it is lexically scoped by construction rather than by a search
at run time — which POPL 2019 gives the general argument for and
docs/38 §38.4 adopts. In a language where
effects decide placement, an accidentally intercepted effect would be an accidental
re-placement.