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def WebIDLTest(parser, harness):
    threw = False
    try:
        parser.parse("""
            interface OneNullableInUnion {
              void foo((object? or DOMString?) arg);
            };
        """)

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

    harness.ok(threw,
               "Two nullable member types of a union should have thrown.")

    parser.reset()
    threw = False

    try:
        parser.parse("""
            interface NullableInNullableUnion {
              void foo((object? or DOMString)? arg);
            };
        """)

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

    harness.ok(threw,
               "A nullable union type with a nullable member type should have "
               "thrown.")

    parser.reset()
    threw = False

    try:
        parser.parse("""
            interface NullableInUnionNullableUnionHelper {
            };
            interface NullableInUnionNullableUnion {
              void foo(((object? or DOMString) or NullableInUnionNullableUnionHelper)? arg);
            };
        """)

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

    harness.ok(threw,
               "A nullable union type with a nullable member type should have "
               "thrown.")