Pinq\Parsing\Resolvers\FunctionMagicResolver::walkConstant PHP Method

    public function walkConstant(O\ConstantExpression $expression)
    {
        $resolvedMagicConstant = $this->resolveMagicConstantValue($expression->getName());
        if ($resolvedMagicConstant !== null) {
            return O\Expression::value($resolvedMagicConstant);
        } else {
            return $expression;
        }
    }