Nick Coghlan added the comment: I've pushed a variant that relies entirely on checking for instruction pointer changes, and it seems quite promising. However, a test_io failure introduced by this variant shows a new way for this version to *create* problems: because of the shift in the way signals are handled, the failing test switches from raising the exception as the last item inside the with statement to instead raising it as the first thing inside the __exit__ statement for a pure-Python context manager.
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