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Some notable changes in this release:

• pool: All pool types now panic if configured after use.
• pool: ContextPool and ResultContextPool now always cancels its context when Wait() returns.
• pool: ContextPool and ResultContextPool now cancels its context when a task panics.
• panics: panics.RecoveredPanic and panics.NewRecoveredPanic(...) have been renamed panics.Recovered and panics.NewRecovered(...) respectively.
• panics: panics.Recovered no longer implements error directly, which would previously have unintended side effects - instead, it can be converted into an error implementation explicitly with (*Recovered).AsError().
• panics: Added a package-level panics.Try(...) for recovering from panics from a single function.
• multierrors: For pools that return multiple errors:
  • in Go 1.20 and later, conc now uses the standard library multi-error implementation
  • in Go 1.19 and earlier, conc now uses the go.uber.org/multierr library

Full changelog: https://github.com/sourcegraph/conc/compare/v0.2.0...v0.3.0

Some of the changes listed above are breaking changes - this package is currently pre-1.0, and there are likely to be other breaking changes before a 1.0 release as we stabilize the APIs and tweak defaults. Please open an issue if you have questions, concerns, or requests that you'd like addressed before the 1.0 release. Currently, a 1.0 is targeted for March 2023.

Some notable changes in this release:

• pool: ContextPool and ResultContextPool no longer cancel on the first task that errors by default. To enable cancellation on first error, use WithCancelOnError.
• panics: conc.PanicCatcher and conc.RecoveredPanic have been moved to a new subpackage, panics.
• iter: Added iter.Iterator and iter.Mapper for configurable concurrency on ForEach, Map, and friends. The top-level iter.ForEach, etc will continue to work as before.
• conc: Added WaitGroup.WaitAndRecover, which returns any recovered panics instead of re-panicking them.

Full changelog: https://github.com/sourcegraph/conc/compare/v0.1.0...v0.2.0

Some of the changes listed above are breaking changes - this package is currently pre-1.0, and there are likely to be other breaking changes before a 1.0 release as we stabilize the APIs and tweak defaults. Please open an issue if you have questions, concerns, or requests that you'd like addressed before the 1.0 release. Currently, a 1.0 is targeted for March 2023.