/usr/share/php/PhpParser/Node/FunctionLike.php is in php-parser 1.4.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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namespace PhpParser\Node;
use PhpParser\Node;
interface FunctionLike extends Node
{
    /**
     * Whether to return by reference
     *
     * @return bool
     */
    public function returnsByRef();
    /**
     * List of parameters
     *
     * @return Node\Param[]
     */
    public function getParams();
    /**
     * Get the declared return type or null
     * 
     * @return null|string|Node\Name
     */
    public function getReturnType();
    /**
     * The function body
     *
     * @return Node\Stmt[]
     */
    public function getStmts();
}
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