docs: public static boolean hasAbstractMember(XtendTypeDeclaration declaration) {
  		if (declaration != null) {
  			for (final XtendMember member : declaration.getMembers()) {
  				if (member instanceof XtendFunction) {
  					if (((XtendFunction) member).isAbstract()) {
  						return true;
  					}
  				}
  			}
  		}
  		return false;
  	}