Implement core::error::Error for all error types

[michael-p]

Closes #179

[thejpster]

The new feature needs adding to the CI workflow, but it'll break the matrix because you can't build it with 1.76. I don't have any good ideas on how to fix that right now - happy to hear if you have any.

[michael-p]

The new feature needs adding to the CI workflow, but it'll break the matrix because you can't build it with 1.76. I don't have any good ideas on how to fix that right now - happy to hear if you have any.

Argh, that's annoying! Sorry, no ideas from my side, except just duplicating the workflow for the core-error feature with Rust 1.81. Do you want me to do that, or would you prefer to just not test this in CI?

[thejpster]

does https://github.com/orgs/community/discussions/26253#discussioncomment-3250989 help?

I wouldn't want to add something that wasn't being tested in CI, as it'll just break.

[avsaase]

You can exclude specific configurations from a matrix job: https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategymatrixexclude

EDIT: I somehow didn't see the previous comment

[thejpster]

MSRV was bumped in #204 so a rebase might fix this

[thejpster]

Thank you for your PR.