chore: fix all cargo clippy suggestions

[berestovskyy]

Running:

% cargo --version
cargo 1.86.0 (adf9b6ad1 2025-02-28)
% cargo clippy --workspace --all-targets -- -D warnings

The cargo clippy CI workflow will be enabled in a subsequent PR.

[berkus]

@berestovskyy looks like there are couple compile errors in bencher.rs

[berestovskyy]

Thanks, @berkus, should be fixed now. It seems the CI strategy is to run cargo build with stable, all, and no features, then run cargo clippy with default features only.

[berkus]

Oh, we need to update clippy to run with all the combinations too.

[berestovskyy]

The clippy and rustfmt CI steps are currently disabled due to unreachable condition: if: ${{ matrix.rust == 'stable' }}. Let's merge this PR now, and I'll prepare a follow-up to enable rustfmt, clippy across four feature sets: none, default, stable, and all (nightly builds only). We can also remove the cargo build steps to save time.

I'd prefer to handle the CI configuration in a separate PR, as it's impossible to replicate locally and may require a few iterations (and potentially your help) to get it passing. Sounds good?

[berkus]

Thanks for taking time to fix this!