Wilfred / trifle

        return Integer(args[0].bigint_value.mod(args[1].bigint_value))

class Div(Function):

    """Integer division. Note this differs from Python's //, which is

    floor division. In Python:

    >>> 4.5 // 1.5

    3.0

    """

    def call(self, args):

        check_args(u'div', args, 2, 2)

        for arg in args:

            if not isinstance(arg, Integer):

                return TrifleExceptionInstance(

                    wrong_type,

                    u"div requires integers, but got: %s." % arg.repr())

        if args[1].bigint_value.eq(RBigInt.fromint(0)):

            return TrifleExceptionInstance(

                division_by_zero,

                u"Divided by zero: %s" % args[1].repr())

        return Integer(args[0].bigint_value.floordiv(args[1].bigint_value))

class LessThan(Function):

# TODO: it would be nice to support floats too

class Mod(Function):

    def call(self, args):

        check_args(u'mod', args, 2, 2)

        for arg in args:

            if not isinstance(arg, Integer):

                return TrifleExceptionInstance(

                    wrong_type,

                    u"mod requires integers, but got: %s." % arg.repr())

        if args[1].bigint_value.eq(RBigInt.fromint(0)):

            return TrifleExceptionInstance(

                division_by_zero,

                u"Divided by zero: %s" % args[1].repr())

        return Integer(args[0].bigint_value.mod(args[1].bigint_value))

class Div(Function):