v0.3.0

[tisonkun]

v0.3.0 (2026-01-31)

Breaking Changes

• Exn::from_iter has been renamed to Exn::raise_all
• exn::Error trait bound has been removed in favor of inlined StdError + Send + Sync + 'static bounds.
• err.raise() has been moved to the exn::ErrorExt extension trait.
• Exn::error(&self) has been replaced with impl Deref<Target = E> for Exn<E>.

New Features

• Exn<E> now implements Deref<Target = E>, allowing for more ergonomic access to the inner error.
• This crate is now no_std compatible, while the alloc crate is still required for heap allocations. It is worth noting that no_std support is a nice-to-have feature, and can be dropped if it blocks other important features in the future. Before 1.0, once exn APIs settle down, the decision on whether to keep no_std as a promise will be finalized.
• Frame now implements std::error::Error.
• Support convert Exn<E> into Box<dyn std::error::Error>.

What's Changed (Detailed Pull Requests)

• chore: reorganize examples by @tisonkun in chore: reorganize examples #19
• refactor!: remove exn::Error by @andylokandy in refactor!: remove exn::Error #23
• test: simplify test code by @tisonkun in test: simplify test code #25
• fix: add Send + Sync bound for error by @andylokandy in fix: add Send + Sync bound for error #26
• refactor: add ErrorExt by @tisonkun in refactor: add ErrorExt #27
• chore: add make_error example by @andylokandy in chore: add make_error example #28
• chore: explicitly add implicit 'static bound by @tisonkun in chore: explicitly add implicit 'static bound #30
• refactor: rename Exn::from_iter to raise_all by @andylokandy in refactor: rename Exn::from_iter to raise_all #33
• feat: Support for #![no_std] by @AlisCode in feat: Support for #![no_std] #22
• docs: improve docs for Exn methods by @tisonkun in docs: improve docs for Exn methods #36
• feat: impl Deref for Exn by @tisonkun in feat: impl Deref for Exn #37
• chore: add and guard MSRV by @tisonkun in chore: add and guard MSRV #39
• feat: impl std::error::Error for Frame by @andylokandy in feat: impl std::error::Error for Frame #29

New Contributors

• @AlisCode made their first contribution in feat: Support for #![no_std] #22

Full Changelog: v0.2.1...v0.3.0

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This discussion was created from the release v0.3.0.