flatten(s1) == [dir1.path, "1:dir2/dir3", "1:dir5/and/more"]

        def s2 = s1.plus(dir1dir2dir4)
        flatten(s2) == [dir1.path, "1:dir2", "2:dir3", "2:dir4", "1:dir5/and/more"]

        def s3 = s2.plus(dir6)
        flatten(s3) == [parent.path, "1:dir1", "2:dir2", "3:dir3", "3:dir4", "2:dir5/and/more", "1:dir6"]

        def s4 = s3.plus(dir1dir2)
        flatten(s4) == [parent.path, "1:dir1", "2:dir2", "2:dir5/and/more", "1:dir6"]

     */
    @CheckReturnValue
    public abstract FileHierarchySet plus(File path);

    /**
     * Returns a set that contains the union of this set and the given absolute path. The set contains the path itself, plus all its descendants.
     */
    @CheckReturnValue
    public abstract FileHierarchySet plus(String absolutePath);

    /**

            classpath = classpath.plus(moduleRegistry.getModule("gradle-dependency-management").getAllRequiredModulesClasspath());
            classpath = classpath.plus(moduleRegistry.getModule("gradle-plugin-use").getAllRequiredModulesClasspath());
            classpath = classpath.plus(moduleRegistry.getModule("gradle-workers").getAllRequiredModulesClasspath());

 *   //   extensionReceiver: null
 *   // }
 *   // accessType: OpAssign {
 *   //   kind: PLUS
 *   //   operand: "b"
 *   //   operationSymbol: String?.plus()
 *   // }
 * }
 * ```
 * Such a call always involve both calls to `get` and `set` functions. With the example above, a call to `String?.plus` is sandwiched
 * between `get` and `set` call to compute the new value passed to `set`.
 *

        assertCanMutate();
        CollectionSupplier<T, C> explicitValue = getExplicitValue(defaultValue).absentIgnoringIfNeeded(ignoreAbsent);
        setSupplier(explicitValue.plus(collector.absentIgnoringIfNeeded(ignoreAbsent)));
    }

    @Nullable
    @Override
    public Class<C> getType() {
        return Cast.uncheckedCast(collectionType);
    }

    @Override

        assertCanMutate();
        MapSupplier<K, V> explicitValue = getExplicitValue(defaultValue).absentIgnoringIfNeeded(ignoreAbsent);
        setSupplier(explicitValue.plus(collector.absentIgnoringIfNeeded(ignoreAbsent)));
    }

    private Configurer getConfigurer() {
        return getConfigurer(false);
    }

    private Configurer getConfigurer(boolean ignoreAbsent) {

            }
        });

        setFrom(Cast.castNullable(FileCollection.class, object));
    }

    @Override
    public FileCollection plus(FileCollection collection) {
        return new UnionFileCollection(taskDependencyFactory, this, (FileCollectionInternal) collection);
    }

    @Override
    public void setFrom(Iterable<?> path) {

	< path;

	unicode !< path;

	# SYSCALL is RUNTIME plus the packages necessary for basic system calls.
	RUNTIME, unicode/utf8, unicode/utf16
	< internal/syscall/windows/sysdll, syscall/js
	< syscall
	< internal/syscall/unix, internal/syscall/windows, internal/syscall/windows/registry
	< internal/syscall/execenv
	< SYSCALL;

	# TIME is SYSCALL plus the core packages about time, including context.
	SYSCALL

	switch verb {
	case 'v', 'b', 'g', 'G', 'x', 'X', 'f', 'F', 'e', 'E':
		oldPlus := p.fmt.plus
		p.buf.writeByte('(')
		p.fmtFloat(real(v), size/2, verb)
		// Imaginary part always has a sign.
		p.fmt.plus = true
		p.fmtFloat(imag(v), size/2, verb)
		p.buf.writeString("i)")
		p.fmt.plus = oldPlus
	default:
		p.badVerb(verb)
	}
}

func (p *pp) fmtString(v string, verb rune) {

            // When not running from a Gradle distro, need the daemon main jar and the daemon server implementation plus the search path to look for other modules
            classpath = registry.getModule("gradle-daemon-server").getAllRequiredModulesClasspath();
            classpath = classpath.plus(registry.getModule("gradle-daemon-main").getImplementationClasspath());