diff --git a/library/smarty/libs/sysplugins/smarty_internal_parsetree_dq.php b/library/smarty/libs/sysplugins/smarty_internal_parsetree_dq.php
deleted file mode 100644
--- a/library/smarty/libs/sysplugins/smarty_internal_parsetree_dq.php
+++ /dev/null
@@ -1,82 +0,0 @@
-<?php
-
-/**
- * Double quoted string inside a tag.
- *
- * @package    Smarty
- * @subpackage Compiler
- * @ignore
- */
-
-/**
- * Double quoted string inside a tag.
- *
- * @package    Smarty
- * @subpackage Compiler
- * @ignore
- */
-class Smarty_Internal_ParseTree_Dq extends Smarty_Internal_ParseTree {
-    /**
-     * Create parse tree buffer for double quoted string subtrees
-     *
-     * @param object $parser parser object
-     * @param Smarty_Internal_ParseTree $subtree parse tree buffer
-     */
-    public function __construct($parser, Smarty_Internal_ParseTree $subtree) {
-        $this->parser = $parser;
-        $this->subtrees[] = $subtree;
-        if ($subtree instanceof Smarty_Internal_ParseTree_Tag) {
-            $this->parser->block_nesting_level = count($this->parser->compiler->_tag_stack);
-        }
-    }
-
-    /**
-     * Append buffer to subtree
-     *
-     * @param Smarty_Internal_ParseTree $subtree parse tree buffer
-     */
-    public function append_subtree(Smarty_Internal_ParseTree $subtree) {
-        $last_subtree = count($this->subtrees) - 1;
-        if ($last_subtree >= 0 && $this->subtrees[$last_subtree] instanceof Smarty_Internal_ParseTree_Tag && $this->subtrees[$last_subtree]->saved_block_nesting < $this->parser->block_nesting_level) {
-            if ($subtree instanceof Smarty_Internal_ParseTree_Code) {
-                $this->subtrees[$last_subtree]->data = $this->parser->compiler->appendCode($this->subtrees[$last_subtree]->data, '<?php echo ' . $subtree->data . ';?>');
-            } elseif ($subtree instanceof Smarty_Internal_ParseTree_DqContent) {
-                $this->subtrees[$last_subtree]->data = $this->parser->compiler->appendCode($this->subtrees[$last_subtree]->data, '<?php echo "' . $subtree->data . '";?>');
-            } else {
-                $this->subtrees[$last_subtree]->data = $this->parser->compiler->appendCode($this->subtrees[$last_subtree]->data, $subtree->data);
-            }
-        } else {
-            $this->subtrees[] = $subtree;
-        }
-        if ($subtree instanceof Smarty_Internal_ParseTree_Tag) {
-            $this->parser->block_nesting_level = count($this->parser->compiler->_tag_stack);
-        }
-    }
-
-    /**
-     * Merge subtree buffer content together
-     *
-     * @return string compiled template code
-     */
-    public function to_smarty_php() {
-        $code = '';
-        foreach ($this->subtrees as $subtree) {
-            if ($code !== "") {
-                $code .= ".";
-            }
-            if ($subtree instanceof Smarty_Internal_ParseTree_Tag) {
-                $more_php = $subtree->assign_to_var();
-            } else {
-                $more_php = $subtree->to_smarty_php();
-            }
-
-            $code .= $more_php;
-
-            if (!$subtree instanceof Smarty_Internal_ParseTree_DqContent) {
-                $this->parser->compiler->has_variable_string = true;
-            }
-        }
-
-        return $code;
-    }
-}