public function leaveNode(Node $node)
    {
        if (self::isConditional($node)) {
            $this->conditionalScopes--;
        } elseif ($node instanceof FuncCall) {
            // if function name is an expression or a variable, give it a pass for now.
            $name = $node->name;
            if (!$name instanceof Expr && !$name instanceof Variable) {
                $shortName = \implode('\\', $name->parts);
                $fullName  = $this->getFullyQualifiedName($name);
                $inScope   = isset($this->currentScope[\strtolower($fullName)]);
                if (!$inScope && !\function_exists($shortName) && !\function_exists($fullName)) {
                    $message = \sprintf('Call to undefined function %s()', $name);
                    throw new FatalErrorException($message, 0, E_ERROR, null, $node->getLine());
                }
            }
        }
    }