recursive lambda as a local variable

[Brian Goetz]

> - using BMRs does not have this effect, if used with a typical unary
> functional expression:

Some examples of bound method references:

   list.stream()
       .filter(goodElements::contains)

or

   list.stream()
       .map(...)
       .forEach(result::add) // though I still usually prefer collect()

or SAM-SAM conversion:

   Function<String, Boolean> f = ...
   Predicate<String> p = f::apply;