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()

```

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):

{"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"}]}