def WebIDLTest(parser, harness):
    threw = False
    try:
        parser.parse("""
            interface AttrSequenceType {
              attribute sequence<object> foo;
            };
        """)

        results = parser.finish()
    except:
        threw = True

    harness.ok(threw, "Attribute type must not be a sequence type")

    parser.reset()

    threw = False
    try:
        parser.parse("""
            interface AttrUnionWithSequenceType {
              attribute (sequence<object> or DOMString) foo;
            };
        """)

        results = parser.finish()
    except:
        threw = True

    harness.ok(threw,
               "Attribute type must not be a union with a sequence member type")

    parser.reset()

    threw = False
    try:
        parser.parse("""
            interface AttrNullableUnionWithSequenceType {
              attribute (sequence<object>? or DOMString) foo;
            };
        """)

        results = parser.finish()
    except:
        threw = True

    harness.ok(threw,
               "Attribute type must not be a union with a nullable sequence "
               "member type")

    parser.reset()

    threw = False
    try:
        parser.parse("""
            interface AttrUnionWithUnionWithSequenceType {
              attribute ((sequence<object> or DOMString) or AttrUnionWithUnionWithSequenceType) foo;
            };
        """)

        results = parser.finish()
    except:
        threw = True

    harness.ok(threw,
               "Attribute type must not be a union type with a union member "
               "type that has a sequence member type")