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No, really, I still think that the comment is wrong. The get_frame_id call triggers the prologue analyzer to analyze the NEXT frame. I.E. this_id is called with the NEXT frame, and THIS cache.
The call to frame_pc_unwind uses THIS frame and creates the PREV cache. It's one frame off on the stack. The frame it would be saving from
prologue analysis is not the one we'd need to analyze for the
get_frame_id call.
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