Treat warnings as errors in CI

[jturner314]

This helps avoid accidentally missing a warning.

[bluss]

I'm thinking we maybe want to have the continue on error flag set on the clippy job (so that other tests also run) (?)

[bluss]

what was the warning here?

[jturner314]

Unused import of arr2 when the std feature is not enabled. There were a number of other similar unused import warnings.

[jturner314]

I'm thinking we maybe want to have the continue on error flag set on the clippy job (so that other tests also run) (?)

I think they were running. (I was just force-pushing to fix warnings before they got a chance to finish.) I have seen items canceled when other items fail, but from what I've seen, it's always been within a job (i.e. within "tests" or within "cross_test"), so the tests should still run if clippy fails. I'll check to make sure.

[bluss]

I think you'd want continue on error, but yeah I wonder why they are running anyway.

https://github.com/petgraph/petgraph/blob/master/.github/workflows/ci.yml#L45

[jturner314]

I came across these pages regarding continue-on-error:

• https://stackoverflow.com/q/62045967
• https://git.luolix.topmunity/t/continue-on-error-allow-failure-ui-indication/16773

which seem to indicate that continue-on-error makes the job always "pass", i.e. get a green check. They suggest to use if: succeeded() || failed() in the run step if you want a job to continue running after a step fails or if: always() if you want it to also continue running after a step is canceled.

I'll try adding continue-on-error to the (currently failing) clippy job to see what happens. Edit: It appears that the links above are outdated. CI (correctly) gives a red X for the clippy job when clippy fails even with continue-on-error: true. That said, since the other jobs continue running after clippy fails even without continue-on-error: true, there doesn't seem to be much reason to add continue-on-error: true.

Edit: Yes, the canceling of items appears to occur within jobs, but not across jobs. (The jobs are tests, cross_test, and clippy.) In the most recent CI test, the clippy job failed, the items in the cross_test job passed, and the beta item in the tests job failed, which caused the other items in the tests job to be canceled.

[bluss]

Thanks