Question about Joiner being an @FunctionalInterface

[David Alayachew]

Hello @loom-dev <loom-dev at openjdk.org>,

I noticed just recently that StructuredTaskScope.Joiner is
an @FunctionalInterface. Is that merely a derived trait automatically
applied by the Javadoc/JDK? Or are there ways to make useful Joiners using
just the unimplemented result()? Only thing I could think of is that it's
useful for creating mock Joiners in unit tests, that just return some
pre-defined value. But even that is limited in its utility.

Thank you for your time and consideration.
David Alayachew
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