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T-Gro merged 2 commits into from
Sep 21, 2026
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[main] Source code updates from dotnet/dotnet #20568

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9f00949
Backflow from https://github.com/dotnet/dotnet / 3d2a481 build 332290
dotnet-maestro[bot] Sep 17, 2026
864eba2
Update dependencies from build 332290
dotnet-maestro[bot] Sep 17, 2026
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8 changes: 8 additions & 0 deletions docs/release-notes/.FSharp.Core/11.0.100.md
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### Added

* Added `AllowOverloadOnReturnTypeAttribute`: applying it to a method causes its return type to be considered during overload resolution, enabling overloads that differ only by return type. ([fslang-suggestions#820](https://github.com/fsharp/fslang-suggestions/issues/820), [PR #19602](https://github.com/dotnet/fsharp/pull/19602))

### Fixed

* Add `inline` and `[<InlineIfLambda>]` to allocation-free `List` and `Array` higher-order functions (`fold`, `fold2`, `foldBack`, `foldBack2`, `reduce`, `reduceBack`, `iter2`, `iteri`, `iteri2`, `find`, `findIndex`, `findBack`, `findIndexBack`, `pick`, `tryPick`, `exists`, `exists2`, `forall`, `forall2`, `skipWhile`), eliminating the per-call closure allocation when a capturing lambda is passed. Error paths are routed through hidden non-inline helpers so localized exception messages are preserved. ([RFC FS-1115](https://github.com/fsharp/fslang-design/blob/main/RFCs/FS-1115-InlineIfLambda-in-FSharp-Core.md), [PR #20422](https://github.com/dotnet/fsharp/pull/20422))
Expand All @@ -18,6 +22,10 @@
* Add `Async.Await`, mirroring `Async.AwaitTask` semantics, but elides egregious `AggregateException` wrapping. Includes `ValueTask` support, and a SRTP-based overload accepting any Task-like value that supports the `GetAwaiter` protocol. ([Language Suggestion #840](https://github.com/fsharp/fslang-suggestions/issues/840), [PR #19785](https://github.com/dotnet/fsharp/pull/19785))
* `Async.RunSynchronouslyImmediate`: runs work on the calling thread until the first asynchronous suspension (as opposed to `RunSynchronously`, which immediately offloads if not on a background and/or threadpool thread). ([Issue #1042](https://github.com/fsharp/fslang-suggestions/issues/1042), [PR #19804](https://github.com/dotnet/fsharp/pull/19804))
* Added `AllowOverloadOnReturnTypeAttribute`: applying it to a method causes its return type to be considered during overload resolution, enabling overloads that differ only by return type. ([fslang-suggestions#820](https://github.com/fsharp/fslang-suggestions/issues/820), [PR #19602](https://github.com/dotnet/fsharp/pull/19602))

### Changed

* Deduplicate repeated XML documentation (sort stability/complexity, `Parallel.For`, dynamic entry points) via the compile-time `<include>` tag; generated FSharp.Core.xml is unchanged. ([PR #20231](https://github.com/dotnet/fsharp/pull/20231))
* Added modules for `Async`, `Task` and `ValueTask` with consistent `result`, `map`, `bind`, `ignore`, `catchWith`, `catch`, and `empty` functions ([LanguageSuggestion #1466](https://github.com/fsharp/fslang-suggestions/issues/1466), [PR #19844](https://github.com/dotnet/fsharp/pull/19844))
* Most `Array` and `Array.Parallel` functions, and the `toArray` conversions (`List.toArray`, `Seq.toArray`, `Array.ofList`/`ofSeq`, `Set.toArray`, `Map.toArray`), now return the shared empty-array singleton instead of allocating a fresh zero-length array when the result is empty. Copies of covariant arrays retain their runtime array type. ([Issue #20382](https://github.com/dotnet/fsharp/issues/20382), [PR #20388](https://github.com/dotnet/fsharp/pull/20388))
* Added conversion functions `Task.ofValueTask` and `ValueTask.ofTask`. ([LanguageSuggestion #1466](https://github.com/fsharp/fslang-suggestions/issues/1466), [PR #19844](https://github.com/dotnet/fsharp/pull/19844))
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2 changes: 1 addition & 1 deletion eng/Version.Details.xml
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<?xml version="1.0" encoding="utf-8"?>
<Dependencies>
<Source Uri="https://github.com/dotnet/dotnet" Mapping="fsharp" Sha="c65c25f0c9889e06a5d70e275c741d8430fa353a" BarId="331079" />
<Source Uri="https://github.com/dotnet/dotnet" Mapping="fsharp" Sha="3d2a4811a58d8ba08bc2162cced36034f98c6b5d" BarId="332290" />
<ProductDependencies>
<Dependency Name="Microsoft.Build" Version="18.12.0-1.26461.2">
<Uri>https://github.com/dotnet/msbuild</Uri>
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