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MethodImpl attribute is silently dropped on property accessors (and leaks into metadata as a real custom attribute)

Area-Compiler-CodeGenIlxGen, ilwrite and things at the backendIlxGen, ilwrite and things at the backend

Bug

Needs-Triage

Status: Open.

#20288 In dotnet/fsharp;

· T-Gro opened on Aug 18, 2026

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Backlog

FSharp.Core #if NET fast-path opportunities — SIMD / span / TensorPrimitives / formatting (unblocked by #20229)

Area-FSharp.Core

Feature Improvement

Performance

Status: Open.

#20283 In dotnet/fsharp;

· T-Gro opened on Aug 18, 2026

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Backlog

[Automated] PRs inserted in VS build main-12117.157

Needs-Triage

vs-insertion

Status: Open.

#20279 In dotnet/fsharp;

· dotnet-bot opened on Aug 18, 2026

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Backlog

Flaky test: FCS tooltip #r reference-assembly resolution is non-deterministic (Fsx.Bug5073, ResolveFromGAC)

Bug

Needs-Triage

Status: Open.

#20276 In dotnet/fsharp;

· T-Gro opened on Aug 17, 2026

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Backlog

Interpolated string annotated obj produces unverifiable IL

Bug

Needs-Triage

Status: Open.

Bug

#20270 In dotnet/fsharp;

· Smaug123 opened on Aug 16, 2026

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Backlog

NullReferenceException breaks IDE syntax coloring on unlinked placeholder entities (e.g. broken code mid-edit)

Needs-Triage

Status: Open.

#20269 In dotnet/fsharp;

· xperiandri opened on Aug 16, 2026

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Backlog

DocumentCache.fs cannot use cancellableTask CE because it does not compile to a static state machine

Needs-Triage

Status: Open.

#20268 In dotnet/fsharp;

· xperiandri opened on Aug 16, 2026

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Backlog

F# compiler internal error FS0073 when merging duplicate property accessors for interface/class property implementation

Needs-Triage

Status: Open.

#20265 In dotnet/fsharp;

· xperiandri opened on Aug 15, 2026

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Backlog

F# compiler crashes when calling inherited base method on external generic IL behavior type (OnDetaching / Behavior<T>)

Needs-Triage

Status: Open.

#20264 In dotnet/fsharp;

· xperiandri opened on Aug 15, 2026

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Backlog

NotSupportedException in memory-mapped-file optimization when copying ReadOnlyMemory into MemoryMappedFileViewStream

Needs-Triage

Status: Open.

#20263 In dotnet/fsharp;

· xperiandri opened on Aug 15, 2026

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Backlog

build.sh no longer works on macOS

Bug

Status: Open.

Bug

#20241 In dotnet/fsharp;

· auduchinok opened on Aug 10, 2026

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Backlog

repo "about" link points to faulty page

Needs-Triage

Status: Open.

#20216 In dotnet/fsharp;

· Martin521 opened on Aug 6, 2026

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Backlog