Type Parameters:

R - Type of the value returned by the mapping function for each case.

Enclosing class:

OneOfN
```
public static interface OneOfN.NoneMatcher<R>
```
A matcher object that contains a handler for each case and can be used to reduce a sum type to a single value. This interface contains a default implementation for each case that simply returns null.

Interface OneOfN.NoneMatcher<R>