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gh-159739: Propagate float rounding allocation failures - #160195
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If the decimal-to-binary conversion inside round(float, ndigits) runs out of memory, it returns a -1.0 error sentinel and sets errno to ENOMEM. Ignoring that error can return -1.0 as a seemingly successful rounded value. Raise MemoryError instead. Backport to 3.15 and 3.14.
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Objects/floatobject.c
| _Py_SET_53BIT_PRECISION_END; | ||
| if (errno == ERANGE && fabs(rounded) >= 1.) | ||
| if (errno == ENOMEM) | ||
| PyErr_NoMemory(); |
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Can we follow PEP 7 please?
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If the decimal-to-binary conversion inside round(float, ndigits) runs out of memory, it returns a -1.0 error sentinel and sets errno to ENOMEM. Ignoring that error can return -1.0 as a seemingly successful rounded value. Raise MemoryError instead. Backport to 3.15 and 3.14.