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bpo-31618: Add NEWS entry for opcode tracing change. #4045

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Oct 19, 2017
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bpo-31618: Add NEWS entry for opcode tracing change. #4045

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7 changes: 7 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2017-10-18-19-41-12.bpo-31618.liLDiS.rst
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The per-frame tracing logic added in 3.7a1 has been altered so that
``frame->f_lineno`` is updated before either ``"line"`` or ``"opcode"``
events are emitted. Previously, opcode events were emitted first, and
therefore would occasionally see stale line numbers on the frame. The
behavior of this feature has changed slightly as a result: when both
``f_trace_lines`` and ``f_trace_opcodes`` are enabled, line events now occur
first.