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Backport my checkin of revision 2.264 of Python/compile.c:
Clamp code objects' tp_compare result to [-1, 1]. Bugfix candidate.
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@@ -133,11 +133,11 @@ code_compare(PyCodeObject *co, PyCodeObject *cp)
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cmp = PyObject_Compare(co->co_name, cp->co_name);
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if (cmp) return cmp;
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cmp = co->co_argcount - cp->co_argcount;
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if (cmp) return cmp;
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if (cmp) return (cmp<0)?-1:1;
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cmp = co->co_nlocals - cp->co_nlocals;
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if (cmp) return cmp;
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if (cmp) return (cmp<0)?-1:1;
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cmp = co->co_flags - cp->co_flags;
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if (cmp) return cmp;
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if (cmp) return (cmp<0)?-1:1;
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cmp = PyObject_Compare(co->co_code, cp->co_code);
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if (cmp) return cmp;
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cmp = PyObject_Compare(co->co_consts, cp->co_consts);
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