alamb opened a new pull request, #836:
URL: https://github.com/apache/arrow-rs-object-store/pull/836
# Which issue does this PR close?
- Closes #835.
# Rationale for this change
#728 added an `Option<Arc<dyn DnsResolver>>` field to `ClientOptions`. Since
`DnsResolver` was only bound by `Debug + Send + Sync`, the trait object did not
implement the `UnwindSafe` / `RefUnwindSafe` auto traits, so `ClientOptions`
(and the store builders embedding it) lost those impls relative to `v0.14.1` —
an accidental breaking change flagged by `cargo semver-checks`.
# What changes are included in this PR?
Add `UnwindSafe + RefUnwindSafe` as supertraits of `DnsResolver`, with a
comment explaining why the bounds exist. This slightly tightens the requirement
on resolver implementations, but since #728 is unreleased no released API is
affected.
# Are these changes tested?
Yes:
- `cargo semver-checks --baseline-rev v0.14.1 --all-features` now passes all
196 checks ("no semver update required"); before this change it reported the
two `auto_trait_impl_removed` failures shown in #835
- Existing DNS tests pass (`cargo test --all-features --lib dns`)
- `cargo check` passes with `--no-default-features`, default, and
`--all-features`
# Are there any user-facing changes?
Implementations of the (unreleased) `DnsResolver` trait must now also be
`UnwindSafe + RefUnwindSafe`. No changes to any released API.
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