[Python-Dev] Reordering opcodes (PEP 203 Augmented Assignment)

[Mark Hammond]

> Can someone summarise what the issues are with SET_LINENO?
> I had the impression that they're not needed for finding the
> line numbers in tracebacks. So what would we lose if they
> disappeared?

The debugger (and quite possibly the profiler - I havent checked!)

As Tim said only a few hours ago:

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Your next job <wink> is to think about how, e.g., you can set a breakpoint
on a specific line of code in the debugger.  Take a quick peek at the
implementation of SET_LINENO in ceval.c, and you'll see that's where the
trace hook is implemented.  No SET_LINENO, no trace callback.  That's what
Vladimir has been trying to solve:  the trick is arranging to pay something
at runtime for it only when you're actually using it.

debuggers-always-need-dirty-tricks-ly y'rs  - tim
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Mark.