The fehler crate is not presently maintained.  (Rumours[1] point to
the maintainer's employer's policies preventing the maintainer from
contribnuting to FLOSS>0

The package has been picked up by the community as "culpa".
We should consider whether we want to import that.

I reviewed the MR titles of the open and closed MRs so far and looked
at the various summary pages.  I think culpa 1.0.x is compatible with
fehler 1.0.0.  (There are some new features in culpa 1.0.2, but they
are fairly minor.)

IMO it would be fine to have *just* the culpa source package in
Debian, and use it to supply a cargo package called "fehler" for those
dependencies that want that.  I have no idea how that would be done
with eg debcargo.  (One .deb that Provides both?)

Filing this as "wishlist" since the current situation is fine for now.

Ian.

[1] https://lib.rs/crates/culpa

I looked into this a bit more and have suggested to withoutboats
(author of fehler) that they might like to grant crate name ownership
to the "culpa" (fork) maintainers.

https://github.com/withoutboats/fehler/issues/70