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Yeah, the whatsnew section needs expanding.  I'll get to
this, but it probably shouldn't hold up the rest of the patch.

ceval.c: oversight.  Good spot.

There's an attempt at explaining the restrictions on
RETURN_NONE in opcode.h, but it's very short.  I'll expand
the comments in maybe_call_line_trace & and pointers to this
in the dis docs and other places.