[Pkg-rust-maintainers] Bug#1054141: fd - incompatible with clap 4.4.6

[Peter Green]

Package: rust-fd-find
Version: 8.7.0-3
Severity: serious

This bug affects both 8.7.0-3 in testing and 8.7.0-4 in unstable.

I recently uploaded clap 4.4.6, since this was not a semver bump I was not
expecting any breakage. Unfortunately it turns out it broke fd.

There are (at least) two issues, the first is that the "unstable-grouped"
feature was removed in clap 4.2.0 by the commit
https://github.com/clap-rs/clap/commit/d5089b267235db72a6ea146ac4f1cb7f79a170a6
"fix!: Remove stablized unstable-grouped feature". By removing the reference to
the "unstable-grouped" feature I was able to successfully build fd and run it's
tests against clap versions 4.2.0 through 4.2.4.

The second issue arises starting with clap version 4.2.5, a bunch of tests fail
with errors like.

---- test_custom_ignore_files stdout ----
thread 'test_custom_ignore_files' panicked at '`fd --ignore-file custom.ignore foo` did not exit successfully.
stdout:
---
---
stderr:
---
thread 'main' panicked at 'Command fd: Argument group 'execs' conflicts with non-existent 'has_results' id', /root/.cargo/registry/src/github.com-1ecc6299db9ec823/clap_builder-4.2.5/src/builder/debug_asserts.rs:317:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
---', tests/testenv/mod.rs:238:13

I'm not sure what should be done about this second issue. I've filed a bug upstream
at https://github.com/sharkdp/fd/issues/1397