[issue24565] the f_lineno getter is broken

[Xavier de Gaye]

Xavier de Gaye <xdegaye at gmail.com> added the comment:

A trace function may also be set in extension modules by PyEval_SetTrace() and it may not use f->f_trace. This is another reason why f->f_trace cannot be used in PyFrame_GetLineNumber() to know when f->f_lineno is valid.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue24565>
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