TreeElement (TreeElement first, ASTNode last, ASTNode anchor, Boolean before) { if (MEMBER_SET.contains(first.getElementType()) && MEMBER_SET.contains(last.getElementType())) { TreeElement firstAdded = super.addInternal(first, last, anchor, before); JavaSourceUtil.addSeparatingComma(this, first, MEMBER_SET); return firstAdded; } return super.addInternal(first, last, anchor, before); }