/**
     * Returns implementation + runtime.
     */
    ClassPath getClasspath();

    /**
     * Returns the modules required by this module.
     */
    Set<Module> getRequiredModules();

    /**
     * Returns the transitive closure of all modules required by this module, including the module itself.
     */
    Set<Module> getAllRequiredModules();

    /**

        }

        @Override
        public String toString() {
            return "module '" + name + "'";
        }

        @Override
        public Set<Module> getRequiredModules() {
            return getModules(projects);
        }

        @Override
        public ClassPath getImplementationClasspath() {
            return implementationClasspath;
        }