ComputedConstant.ofEmpty() javadoc has a reference to a method that does not exist

[Remi Forax]

Hi Per,
in the javadoc referenced by the JEP, the doc of ofEmpty() has the following snippet of code

         private static final ComputedConstant<Foo> FOO = ComputedConstant.ofEmpty();

         public Foo theBar() {
             // Foo is lazily constructed and recorded here upon first invocation
             return FOO.computeIfUnbound(Foo::new);
         }

I was not able to find a description of the method computeIfUnbound ?

regards,
Rémi