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feat: add MatchAsync, MapAsync and ThenAsync - #36
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Minimal async (V10) with dotResult's R8 semantics: Task delegates, ValueTask results, immediate argument checks, delegate exceptions through the ValueTask, cancellation for a requested token, and the passing-through case already complete. The library never resumes on the caller's context. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012weRUz3QcTAaQw32ZmQkoK
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| catch (Exception exception) | ||
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| return ValueTask.FromException<TResult>(exception); | ||
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| return ValueTask.FromException<TResult>(exception); | ||
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What
TP-10, card 6.1 of milestone M6 (1.0.0-beta.1): minimal async (V10).
MatchAsync(valid, invalid)with an async or a synchronous invalid branch,MapAsync(map)andThenAsync(next). The delegates returnTask<…>and the methods returnValueTask<…>. Semantics as R8 in dotResult: arguments and the uninitialized default are checked immediately; whatever a delegate does, including a synchronous throw, comes out when awaited; anOperationCanceledExceptionfor a requested token gives a canceled result; the passing-through case is already complete. A null frommap, or an uninitialized validation fromnext, fails when awaited.Tests:
AsyncProperties(agree withMatch/Map/Thenfor completed and yielding tasks; exactly one branch; pass-through completes at once and runs nothing; throws only when awaited, including from the synchronous invalid branch; cancellation; missing delegates). Also uninitialized lines and allocation lines with completed tasks (0 B). Stryker found two gaps that are now covered: a throwing synchronous invalid branch, andConfigureAwait(false). A countingSynchronizationContextwith a task that really waits checks that the library never resumes on the caller's context. Stryker locally: 100 %. README "Async"; the AOT smoke test covers all three members.Closes #15
Checklist
dotnet test --solution dotValid.slnxis green locally🤖 Generated with Claude Code
https://claude.ai/code/session_012weRUz3QcTAaQw32ZmQkoK