Jelle Zijlstra added the comment:
The reason for this behavior is that the trace function is called whenever
execution in the bytecode jumps to a new source line. See ceval.c line 4440 or
so:
/* If the last instruction falls at the start of a line or if
it represents a jump backwards, update the frame's line
number and call the trace function. */
Running dis.dis on x in the example file shows that the bytecode for returning
None is assigned to the "pass" line.
I think the bug here is really with the line number assignment in the bytecode,
not with the tracing, but I don't see an obvious way to fix it.
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nosy: +Jelle Zijlstra
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<http://bugs.python.org/issue13548>
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