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[release/10.0.4xx] Backport F# 18.11 product changes - #20725

Merged

T-Gro merged 68 commits into

dotnet:release/10.0.4xxfrom

T-Gro:backport/dev18.11-to-10.0.4xx

Oct 16, 2026

Merged

[release/10.0.4xx] Backport F# 18.11 product changes#20725
T-Gro merged 68 commits into
dotnet:release/10.0.4xxfrom
T-Gro:backport/dev18.11-to-10.0.4xx

Commits on Oct 7, 2026
- Avoid leaking a MeterListener per Cache in DEBUG builds (#19995)
  
  NatElkins
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  T-Gro
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  3af7bc9
- Add ResetCompilerGeneratedNameState to compiler-generated name generators (#20017)
  
  NatElkins
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  46be812
- Localized file check-in by OneLocBuild Task: Build definition ID 499: Build ID 3013177 (#20023)
  
  authored and
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  e8e8029
- Tests/source context: support multiple carets (#20077)
  
  auduchinok
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  be37bef
- Move VS language-service logic tests to FSharp.Compiler.Service.Tests (#20033)
  T-Gro
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  bfbbc39
- Add Roslyn-format EnC CustomDebugInformation codec and portable PDB method CDI emission (#20018)
  
  NatElkins
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  efe2a83
- Add stable synthesized-name replay infrastructure for hot reload (#20024)
  
  NatElkins
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  7f18589
- Fix #19457: lift CE constructs from plain let RHS in computation expressions (#19868)
  T-Gro
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  f834fc3
- Fix attribute resolution in recursive module/namespace scopes (#19744)
  T-Gro
  committed
  9b35d3c
- Correct StructLayout size emission for data-less struct unions (#19759)
  
  Copilot
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  committed
  c4e161b
- Report FS3888 for generic attribute type abbreviations instead of FS0193 (#19915)
  T-Gro
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  b8bde73
- Support NotNullIfNotNullAttribute (#19977)
  
  kerams
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  fba9ecb
- Compiled ToStrings under -reflectionfree for DUs and Records (#19976)
  
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  fa91707
- Run ilverify via the tool manifest instead of a hard-coded cache path (#20101)
  
  abonie
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  66b57ac
- Record spreads (#18927)
  
  brianrourkeboll
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  4a4957c
- Implement interpolated strings via String.Concat (#19971)
  
  charlesroddie
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  ff07413
- Secure release-note checks for fork pull requests (#20081)
  
  NatElkins
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  522aef7
- Update test project to net11 (#20104)
  
  abonie
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  b756176
- LexFilter: drop non-strict mode (#20106)
  
  auduchinok
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  02f5448
- Implement direct delegates (#19993)
  
  kerams
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  committed
  8c7ac93
- Fix check_release_notes 403 by restoring pull-requests: write and making the comment non-fatal (#20198)
  T-Gro
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  6cb1aac
- Adopt ordered multi-caret markers in FCS tests (no behaviour change) (#20082)
  
  T-Gro
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  f333f36
- Record spreads: off-by-default shadowing warnings (#20206)
  
  brianrourkeboll
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  130f20c
- Remove always-on PrintfBinaryFormat language feature flag (#20202)
  
  committed
  7a67a97
- Stabilize preview language features into F# 11.0 (#20199)
  
  T-Gro
  and
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  committed
  d4852d5
- Implement `<inheritdoc>` XML documentation support for F# (#19188)
  
  Copilot
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  a81ec2e
- Add support for `<include>` XML documentation tag (#19186)
  
  Copilot
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  committed
  0972f1d
- Fix false prompt-injection alarm on PR Tooling Safety Check bypass labels (#20130)
  T-Gro
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  e854870
- feat(Async): RunSynchronouslyImmediate (#19804)
  
  bartelink
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  committed
  27b2eb7
- Add ECMA-335 EnC metadata delta writer (#20019)
  
  NatElkins
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  committed
  04273a1
- Remove always-on StructActivePattern language feature flag (#20208)
  T-Gro
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  195263e
- Remove always-on OpenTypeDeclaration language feature flag (#20209)
  T-Gro
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  870ac12
- Allow closing '>' of multiline nested type arguments to align with the opener (#15171) (#20003)
  
  edgarfgp
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  committed
  0820d96
- Record constructors (FS-1073) (#19974)
  
  charlesroddie
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  committed
  1d374c6
- docs: update state-machine.md for changed workflow SHAs (#20234)
  
  authored and
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  974fffe
- Localized file check-in by OneLocBuild Task: Build definition ID 499: Build ID 3039021 (#20108)
  
  authored and
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  911bb03
- Enable MSBuild node reuse defaults in eng/Build.ps1 and eng/build.sh (#20220)
  
  T-Gro
  and
  Copilot
  committed
  4b6dc12
- Fix spurious FS0410 for tuple patternInput bindings (#4161) (#19947)
  
  KirtiRamchandani
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  committed
  5f52351
- Ignore lines starting with `#:` (RFC-1337) (#20212)
  
  Martin521
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  committed
  0f654a8
- feat(Async+Task+ValueTask): consistent helper modules (#19844)
  
  bartelink
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  committed
  43d2a4c
- Add hot reload baseline reading and recorded EnC state (#20026)
  
  NatElkins
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  committed
  efb0fc6
- Optimizer: propagate NoDynamicInvocation (#20242)
  
  auduchinok
  authored and
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  committed
  67fc341
- Support OverloadResolutionPriority and a most-concrete overload tiebreaker
  T-Gro
  committed
  0704c3c
- Remove always-on UseBindingValueDiscard language feature flag (#20162) (#20218)
  
  committed
  f7cdef3
- Remove always-on WildCardInForLoop language feature flag (#20221)
  
  committed
  3bd56f2
- Remove always-on AndBang language feature flag (#20223)
  
  committed
  a0018d9
- Remove always-on ImplicitYield language feature flag (#20230)
  
  committed
  e4e344b
- Import: Don't walk non-F# assemblies when labelling trait constraint sources (#20090)
  
  auduchinok
  authored and
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  committed
  1050d64
- chore(Async.RunSynchronouslyImmediate): Stragglers re #19804 (#20245)
  
  bartelink
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  committed
  cefd6c4
- Parser: recover on unfinished abstract members (#20070)
  
  auduchinok
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  committed
  86c34be
- Remove always-on SingleUnderscorePattern language feature flag (#20222)
  
  committed
  88a8623
- Add symbol and type highlighting to F# diagnostics (#20097)
  
  auduchinok
  authored and
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  committed
  e04c524
- Avoid per-instance lock object in InterruptibleLazy and DelayInitArrayMap (#20088)
  
  auduchinok
  authored and
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  committed
  d903010
- Regression matrix: build unmodified repos against local FSharp.Core (#20240)
  T-Gro
  committed
  324c5d0
- IL: add ILPreNamespace, make ILPreTypeDef creation lazy (#20092)
  
  auduchinok
  authored and
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  committed
  687e283
- feat(Async): Add exception-unwrapping Await (#19785)
  
  bartelink
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  committed
  d9c654c
- IL: fix leaking binary view (#20250)
  
  auduchinok
  authored and
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  committed
  8b31d77
- IL: use empty tables for members when possible (#20249)
  
  auduchinok
  authored and
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  committed
  9425d97
- Add regression test: #14454, IAsyncDisposable use in task CE in FSI (#20251)
  
  github-actions[bot]
  authored and
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  committed
  dc8127b
- Teach compiler driver to ignore unknown warning codes (#20246)
  
  Copilot
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  committed
  a344af6
- Remove always-on RelaxWhitespace language feature flag (#20226)
  T-Gro
  committed
  254adcd
- Add nullness regression test for recursive inline SRTP memoization (#20247)
  T-Gro
  committed
  02d539a
- Ship FSharp.Core with a net10.0 target framework (selective port of #20229)
  T-Gro
  committed
  5c78723
- Flow release/10.0.4xx into rel/d18.11-ltsc for VS insertion (adapted from #20412)
  T-Gro
  committed
  82ece42
- Fix ILVerify baseline filenames for net10.0 FSharp.Core asset (follow-up to #20229 adaptation)
  T-Gro
  committed
  9148ae5
Commits on Oct 9, 2026
- Merge branch 'release/10.0.4xx' into backport/dev18.11-to-10.0.4xx
  T-Gro
  authored
  c4a0f1a
Commits on Oct 13, 2026
- Use the 43.13 FCS family for the 18.11 backport
  
  T-Gro
  and
  Copilot
  committed
  d833001
Commits on Oct 15, 2026
- Merge release/10.0.4xx into backport/dev18.11-to-10.0.4xx
  
  T-Gro
  and
  Copilot
  committed
  37ac748

Commits

Commits on Oct 7, 2026

Commits on Oct 9, 2026

Commits on Oct 13, 2026

Commits on Oct 15, 2026