Runtime Async Feature#19449

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TheAngryByrd wants to merge 38 commits intodotnet:mainfrom

TheAngryByrd:19056-methodimpl-async-2

Commits on Feb 28, 2026

feat(compiler): register LanguageFeature.RuntimeAsync and add ILMethodDef.IsAsync
TheAngryByrd
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feat(compiler): wire 0x2000 async flag through IlxGen
TheAngryByrd
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feat(compiler): add type checker validation rules for runtime-async
TheAngryByrd
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feat(compiler): add RuntimeFeature.Async capability check
TheAngryByrd
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feat(compiler): add ExprContainsAsyncHelpersAwaitCall detection
TheAngryByrd
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feat(compiler): implement return-type unwrapping for async methods
TheAngryByrd
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feat(fsharp-core): add RuntimeAsyncAttribute for library extensibility
TheAngryByrd
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feat(fsharp-core): add RuntimeTaskBuilder and runtimeTask CE
TheAngryByrd
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test: add IL baseline and validation error tests for runtime-async
TheAngryByrd
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fix(fsharp-core): remove net10.0 TFM (breaks bootstrap build)
TheAngryByrd
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fix(compiler): move RuntimeAsync return type validation after type inference
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fix(tests): use enum cast for MethodImplOptions.Async (not available on net472)
TheAngryByrd
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test: update surface area baselines for RuntimeAsyncAttribute and ILMethodDef.IsAsync
TheAngryByrd
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test: add behavioral and edge case tests for runtime-async
TheAngryByrd
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fix(fsharp-core): minor fixes to runtimeAsync and project file

TheAngryByrd
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sisyphus-dev-ai
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fix(compiler): pre-unification approach for runtime-async return type in CheckExpressions

TheAngryByrd
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sisyphus-dev-ai
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fix(compiler): handle non-generic Task/ValueTask return and fix async keyword positioning in IL

TheAngryByrd
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sisyphus-dev-ai
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test: add runNewProcess helpers and update MethodImplAttribute behavioral tests

TheAngryByrd
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sisyphus-dev-ai
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docs: add runtime-async feature documentation
TheAngryByrd
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test: add runtimeTask CE unit tests
TheAngryByrd
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test: add runtimeTask CE unit tests
TheAngryByrd
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Commits on Mar 1, 2026

Commits on Mar 2, 2026

Commits on Mar 3, 2026

Commits on Mar 4, 2026