https://clickhouse-test-reports.s3.yandex.net/20492/c5b96a522e29b38eae3f6c2d945540dd234e3c34/fuzzer_msan/server.log

```
for i in {1..100}; do clickhouse-client --query "SELECT toUInt8(assumeNotNull(cast(cast(NULL, 'Nullable(String)'), 'Nullable(Enum8(\'Hello\' = 1))')))"; done

160
224
128
192
64
64
32
160
128
192
128
224
128
160
0
96
64
32
192
224
64
96
224
96
128
192
192
128
...
```
{
        const auto & column = arguments.back().column;
        if (!column)
            throw Exception("Second argument to " + getName() + " must be a constant string describing type."
                " Instead there is non-constant column of type " + arguments.back().type->getName(),
                ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
        const auto * type_col = checkAndGetColumnConst<ColumnString>(column.get());
        if (!type_col)
            throw Exception("Second argument to " + getName() + " must be a constant string describing type."
                " Instead there is a column with the following structure: " + column->dumpStructure(),
                ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
        DataTypePtr type = DataTypeFactory::instance().get(type_col->getValue<String>());
        if constexpr (cast_type == CastType::accurateOrNull)
        {
            return makeNullable(type);
        }
        else
        {
            if (keep_nullable && arguments.front().type->isNullable())
                return makeNullable(type);
            return type;
        }
    }
    bool useDefaultImplementationForNulls() const override { return false; }