code: 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;
  	}
docs: Replies if the given declaration has an abstract member.
  
  @param declaration - the declaration.
  @return <code>true</code> if the given type has an abstract function.