for (int i = node.generators.length - 1; i >= 0; i--) {
listcompType lc = node.generators[i];
for (int j = lc.ifs.length - 1; j >= 0; j--) {
n = new If(lc.ifs[j], new stmtType[] { n }, null, lc.ifs[j]);
}
n = new For(lc.target, lc.iter, new stmtType[] { n }, null, lc);
}
visit(n);
visit(new Delete(new exprType[] { new Name(tmp_append, Name.Del) }));
return null;