<description>
            All the sources to compile and resources files to copy for a project or it's unit tests.
            The sources can be Java source files, generated source files, scripts, or resources for examples.
            Each source is specified by a {@code directory} element, which is relative to the POM.
            The kind of sources (source files to compile or resources to copy) and their usage (for the main code

    Callable<String> combiner = () -> "hi";

    // We'd like for all the following to compile.
    ListenableFuture<String> unused;

    // Compiles:
    unused = whenAllComplete(futureA, futureB).call(combiner, directExecutor());

    // Does not compile:
    // unused = whenAllComplete(futures).call(combiner);

    // Workaround for the above:

    Callable<String> combiner = () -> "hi";

    // We'd like for all the following to compile.
    ListenableFuture<String> unused;

    // Compiles:
    unused = whenAllComplete(futureA, futureB).call(combiner, directExecutor());

    // Does not compile:
    // unused = whenAllComplete(futures).call(combiner);

    // Workaround for the above:

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