IronLanguages / IronLanguages/ironpython3

dynamic binding issue with _io.BytesIO/_io.StringIO

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module-io
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C#
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Description

The following error comes up when running CPython.test_memoryio.test_instance_dict_leak:

TypeError: The result type 'System.Int32' of the dynamic binding produced by the object with type 'IronPython.Modules.PythonIOModule+StringIO' for the binder 'Python SetMember foo' is not compatible with the result type 'System.Object' expected by the call site.

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the failure in CPython.test_memoryio.test_instance_dict_leak and inspect the dynamic binding path involved for _io.BytesIO and _io.StringIO. Done means the test no longer raises the reported TypeError and the affected member assignment produces a compatible result type.

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Assessment

Tech stack
csharp, python
Domain
devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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