@Override
    public String toString() {
        return displayName.getDisplayName();
    }

    @Override
    public boolean add(final DependencyConstraint dependencyConstraint) {
        assertConfigurationIsDeclarable();
        clientConfiguration.maybeEmitDeclarationDeprecation();
        if (dependencyConstraint instanceof DependencyConstraintInternal) {

    public boolean add(final Dependency o) {
        assertConfigurationIsDeclarable();
        clientConfiguration.maybeEmitDeclarationDeprecation();
        if (o instanceof AbstractModuleDependency) {
            ((AbstractModuleDependency) o).addMutationValidator(mutationValidator);
        }
        return super.add(o);
    }

    private void assertConfigurationIsDeclarable() {
        if (!clientConfiguration.isCanBeDeclared()) {