This pull request changes how Iterator(T) yields its next value. It used to return a (T, bool), where it was understood that returning false would result in termination of the iteration and that the T value given should be ignored. This had needlessly complicated semantics and can be easily replaced with ? T as the return type, since ? T encodes the presence or absence of a value.
This pull request changes how
Iterator(T)yields its next value. It used to return a(T, bool), where it was understood that returningfalsewould result in termination of the iteration and that theTvalue given should be ignored. This had needlessly complicated semantics and can be easily replaced with? Tas the return type, since? Tencodes the presence or absence of a value.