gh-136190: dis.py: No line number in case of an artificial bytecode instruction

[andreas-loos-zon]

This is a proposal to fix gh-136190 (at least in dis).

If the compiler returns no line number in case of an artificial bytecode instruction, then we show the last known line number.

[bedevere-app]

Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

[bedevere-app]

Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

[StanFromIreland]

In the future, please add the issue number to the title (I have edited this prs title to the correct format) so that it can be automatically linked.

[StanFromIreland]

Familiarise yourself with the current layout of stdlib tests, and move your tests there. They should be updated to use unittest like the existing tests, and cleaned up, removing commented out tests.

[nedbat]

I'm not sure it's useful to change dis to supply the missing number. I would rather that the deeper information used by other tools (like coverage.py) was more correct, and that dis was a relatively shallow viewer of that data.

For example, you said on the issue: "disadvantage: other inspection tool would then still show no line number".

[picnixz]

I agree. I would rather fix the location on the interpreter's side rather than in dis.

[andreas-loos-zon]

So let's close this PR.