prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  AttributeError: 'StructureTopLevel' object has no attribute 'contract'
  On 0x0cf55d57d241161e0ec68e72cbb175dbfe84173a
  
  Here there should be a different case for top-level elements and non-top-level:
  
  https://github.com/crytic/slither/blob/c0c581b3ba830b6ce8dc3f4be82592a7a42e9752/slither/core/solidity_types/user_defined_type.py#L65-L66
  AttributeError: 'StructureTopLevel' object has no attribute 'contract'
  On 0x0cf55d57d241161e0ec68e72cbb175dbfe84173a
  
  Here there should be a different case for top-level elements and non-top-level:
  
  https://github.com/crytic/slither/blob/c0c581b3ba830b6ce8dc3f4be82592a7a42e9752/slither/core/solidity_types/user_defined_type.py#L65-L66
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `slither/core/solidity_types/user_defined_type.py`
  Content:
  ```
  1 from typing import Union, TYPE_CHECKING, Tuple
  2 import math
  3 
  4 from slither.core.solidity_types.type import Type
  5 from slither.exceptions import SlitherException
  6 
  7 if TYPE_CHECKING:
  8     from slither.core.declarations.structure import Structure
  9     from slither.core.declarations.enum import Enum
  10     from slither.core.declarations.contract import Contract
  11 
  12 # pylint: disable=import-outside-toplevel
  13 class UserDefinedType(Type):
  14     def __init__(self, t):
  15         from slither.core.declarations.structure import Structure
  16         from slither.core.declarations.enum import Enum
  17         from slither.core.declarations.contract import Contract
  18 
  19         assert isinstance(t, (Contract, Enum, Structure))
  20         super().__init__()
  21         self._type = t
  22 
  23     @property
  24     def type(self) -> Union["Contract", "Enum", "Structure"]:
  25         return self._type
  26 
  27     @property
  28     def storage_size(self) -> Tuple[int, bool]:
  29         from slither.core.declarations.structure import Structure
  30         from slither.core.declarations.enum import Enum
  31         from slither.core.declarations.contract import Contract
  32 
  33         if isinstance(self._type, Contract):
  34             return 20, False
  35         if isinstance(self._type, Enum):
  36             return int(math.ceil(math.log2(len(self._type.values)) / 8)), False
  37         if isinstance(self._type, Structure):
  38             # todo there's some duplicate logic here and slither_core, can we refactor this?
  39             slot = 0
  40             offset = 0
  41             for elem in self._type.elems_ordered:
  42                 size, new_slot = elem.type.storage_size
  43                 if new_slot:
  44                     if offset > 0:
  45                         slot += 1
  46                         offset = 0
  47                 elif size + offset > 32:
  48                     slot += 1
  49                     offset = 0
  50 
  51                 if new_slot:
  52                     slot += math.ceil(size / 32)
  53                 else:
  54                     offset += size
  55             if offset > 0:
  56                 slot += 1
  57             return slot * 32, True
  58         to_log = f"{self} does not have storage size"
  59         raise SlitherException(to_log)
  60 
  61     def __str__(self):
  62         from slither.core.declarations.structure import Structure
  63         from slither.core.declarations.enum import Enum
  64 
  65         if isinstance(self.type, (Enum, Structure)):
  66             return str(self.type.contract) + "." + str(self.type.name)
  67         return str(self.type.name)
  68 
  69     def __eq__(self, other):
  70         if not isinstance(other, UserDefinedType):
  71             return False
  72         return self.type == other.type
  73 
  74     def __hash__(self):
  75         return hash(str(self))
  76
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/slither/core/solidity_types/user_defined_type.py b/slither/core/solidity_types/user_defined_type.py
  --- a/slither/core/solidity_types/user_defined_type.py
  +++ b/slither/core/solidity_types/user_defined_type.py
  @@ -59,12 +59,13 @@
           raise SlitherException(to_log)
   
       def __str__(self):
  -        from slither.core.declarations.structure import Structure
  -        from slither.core.declarations.enum import Enum
  +        from slither.core.declarations.structure_contract import StructureContract
  +        from slither.core.declarations.enum_contract import EnumContract
   
  -        if isinstance(self.type, (Enum, Structure)):
  -            return str(self.type.contract) + "." + str(self.type.name)
  -        return str(self.type.name)
  +        type_used = self.type
  +        if isinstance(type_used, (EnumContract, StructureContract)):
  +            return str(type_used.contract) + "." + str(type_used.name)
  +        return str(type_used.name)
   
       def __eq__(self, other):
           if not isinstance(other, UserDefinedType):
  
verification_info: {"golden_diff": "diff --git a/slither/core/solidity_types/user_defined_type.py b/slither/core/solidity_types/user_defined_type.py\n--- a/slither/core/solidity_types/user_defined_type.py\n+++ b/slither/core/solidity_types/user_defined_type.py\n@@ -59,12 +59,13 @@\n         raise SlitherException(to_log)\n \n     def __str__(self):\n-        from slither.core.declarations.structure import Structure\n-        from slither.core.declarations.enum import Enum\n+        from slither.core.declarations.structure_contract import StructureContract\n+        from slither.core.declarations.enum_contract import EnumContract\n \n-        if isinstance(self.type, (Enum, Structure)):\n-            return str(self.type.contract) + \".\" + str(self.type.name)\n-        return str(self.type.name)\n+        type_used = self.type\n+        if isinstance(type_used, (EnumContract, StructureContract)):\n+            return str(type_used.contract) + \".\" + str(type_used.name)\n+        return str(type_used.name)\n \n     def __eq__(self, other):\n         if not isinstance(other, UserDefinedType):\n", "issue": "AttributeError: 'StructureTopLevel' object has no attribute 'contract'\nOn 0x0cf55d57d241161e0ec68e72cbb175dbfe84173a\r\n\r\nHere there should be a different case for top-level elements and non-top-level:\r\n\r\nhttps://github.com/crytic/slither/blob/c0c581b3ba830b6ce8dc3f4be82592a7a42e9752/slither/core/solidity_types/user_defined_type.py#L65-L66\nAttributeError: 'StructureTopLevel' object has no attribute 'contract'\nOn 0x0cf55d57d241161e0ec68e72cbb175dbfe84173a\r\n\r\nHere there should be a different case for top-level elements and non-top-level:\r\n\r\nhttps://github.com/crytic/slither/blob/c0c581b3ba830b6ce8dc3f4be82592a7a42e9752/slither/core/solidity_types/user_defined_type.py#L65-L66\n", "before_files": [{"content": "from typing import Union, TYPE_CHECKING, Tuple\nimport math\n\nfrom slither.core.solidity_types.type import Type\nfrom slither.exceptions import SlitherException\n\nif TYPE_CHECKING:\n    from slither.core.declarations.structure import Structure\n    from slither.core.declarations.enum import Enum\n    from slither.core.declarations.contract import Contract\n\n# pylint: disable=import-outside-toplevel\nclass UserDefinedType(Type):\n    def __init__(self, t):\n        from slither.core.declarations.structure import Structure\n        from slither.core.declarations.enum import Enum\n        from slither.core.declarations.contract import Contract\n\n        assert isinstance(t, (Contract, Enum, Structure))\n        super().__init__()\n        self._type = t\n\n    @property\n    def type(self) -> Union[\"Contract\", \"Enum\", \"Structure\"]:\n        return self._type\n\n    @property\n    def storage_size(self) -> Tuple[int, bool]:\n        from slither.core.declarations.structure import Structure\n        from slither.core.declarations.enum import Enum\n        from slither.core.declarations.contract import Contract\n\n        if isinstance(self._type, Contract):\n            return 20, False\n        if isinstance(self._type, Enum):\n            return int(math.ceil(math.log2(len(self._type.values)) / 8)), False\n        if isinstance(self._type, Structure):\n            # todo there's some duplicate logic here and slither_core, can we refactor this?\n            slot = 0\n            offset = 0\n            for elem in self._type.elems_ordered:\n                size, new_slot = elem.type.storage_size\n                if new_slot:\n                    if offset > 0:\n                        slot += 1\n                        offset = 0\n                elif size + offset > 32:\n                    slot += 1\n                    offset = 0\n\n                if new_slot:\n                    slot += math.ceil(size / 32)\n                else:\n                    offset += size\n            if offset > 0:\n                slot += 1\n            return slot * 32, True\n        to_log = f\"{self} does not have storage size\"\n        raise SlitherException(to_log)\n\n    def __str__(self):\n        from slither.core.declarations.structure import Structure\n        from slither.core.declarations.enum import Enum\n\n        if isinstance(self.type, (Enum, Structure)):\n            return str(self.type.contract) + \".\" + str(self.type.name)\n        return str(self.type.name)\n\n    def __eq__(self, other):\n        if not isinstance(other, UserDefinedType):\n            return False\n        return self.type == other.type\n\n    def __hash__(self):\n        return hash(str(self))\n", "path": "slither/core/solidity_types/user_defined_type.py"}], "after_files": [{"content": "from typing import Union, TYPE_CHECKING, Tuple\nimport math\n\nfrom slither.core.solidity_types.type import Type\nfrom slither.exceptions import SlitherException\n\nif TYPE_CHECKING:\n    from slither.core.declarations.structure import Structure\n    from slither.core.declarations.enum import Enum\n    from slither.core.declarations.contract import Contract\n\n# pylint: disable=import-outside-toplevel\nclass UserDefinedType(Type):\n    def __init__(self, t):\n        from slither.core.declarations.structure import Structure\n        from slither.core.declarations.enum import Enum\n        from slither.core.declarations.contract import Contract\n\n        assert isinstance(t, (Contract, Enum, Structure))\n        super().__init__()\n        self._type = t\n\n    @property\n    def type(self) -> Union[\"Contract\", \"Enum\", \"Structure\"]:\n        return self._type\n\n    @property\n    def storage_size(self) -> Tuple[int, bool]:\n        from slither.core.declarations.structure import Structure\n        from slither.core.declarations.enum import Enum\n        from slither.core.declarations.contract import Contract\n\n        if isinstance(self._type, Contract):\n            return 20, False\n        if isinstance(self._type, Enum):\n            return int(math.ceil(math.log2(len(self._type.values)) / 8)), False\n        if isinstance(self._type, Structure):\n            # todo there's some duplicate logic here and slither_core, can we refactor this?\n            slot = 0\n            offset = 0\n            for elem in self._type.elems_ordered:\n                size, new_slot = elem.type.storage_size\n                if new_slot:\n                    if offset > 0:\n                        slot += 1\n                        offset = 0\n                elif size + offset > 32:\n                    slot += 1\n                    offset = 0\n\n                if new_slot:\n                    slot += math.ceil(size / 32)\n                else:\n                    offset += size\n            if offset > 0:\n                slot += 1\n            return slot * 32, True\n        to_log = f\"{self} does not have storage size\"\n        raise SlitherException(to_log)\n\n    def __str__(self):\n        from slither.core.declarations.structure_contract import StructureContract\n        from slither.core.declarations.enum_contract import EnumContract\n\n        type_used = self.type\n        if isinstance(type_used, (EnumContract, StructureContract)):\n            return str(type_used.contract) + \".\" + str(type_used.name)\n        return str(type_used.name)\n\n    def __eq__(self, other):\n        if not isinstance(other, UserDefinedType):\n            return False\n        return self.type == other.type\n\n    def __hash__(self):\n        return hash(str(self))\n", "path": "slither/core/solidity_types/user_defined_type.py"}]}