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Assertion failure when specializing functions with too many__defaults__ #105840

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brandtbucher
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3.11only security fixes3.12only security fixes3.13bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)triagedThe issue has been accepted as valid by a triager.type-crashA hard crash of the interpreter, possibly with a core dump
@brandtbucher

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@brandtbucher

When specializing some Python calls, we assert that we don't have more defaults than we have arguments. This isn't always true, though:

>>>deff():...pass...>>>f.__defaults__= (None,)>>>for_inrange(2):...f()...python:Python/specialize.c:1650:specialize_py_call:Assertion `defcount<=argcount'failed.Aborted

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3.11only security fixes3.12only security fixes3.13bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)triagedThe issue has been accepted as valid by a triager.type-crashA hard crash of the interpreter, possibly with a core dump

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