Type Alias BoxedIter 

pub type BoxedIter<'a, T> = Box<dyn _IterTrait<'a, T> + 'a>;

Type alias for boxed _IterTrait trait objects.

Prefer BoxedIter over impl _IterTrait when using trait objects ( dyn _IterTrait ) because the concrete type in return is less restrictive than impl _IterTrait.

Aliased Type

pub struct BoxedIter<'a, T>(/* private fields */);