[issue26107] PEP 511: code.co_lnotab: use signed line number delta to support moving instructions in an optimizer

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Yes, you patch supersedes issue16956 patch.

Added new comments on Rietveld for lnotab_notes.txt.

I afraid this patch can cause problems with code tracing where it is assumed that lines are increased monotonically and *instr_lb <= frame->f_lasti < *instr_ub. We should carefully analyze the effect of the patch on the tracing.

Before committing you must ask Guido for approval. AFAIK his had objections against code transformations that make debugging harder.

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