[Repo Assist] Monthly Activity 2026-04

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Activity for April 2026

Suggested Actions for Maintainer

Comprehensive list of all pending actions requiring maintainer attention:

• Merge PR Add regression test: #13114, SynPat.Record and QuoteExpr traversal #19468: regression test for defaultTraverse for SynPat in SyntaxTraverse.Traverse doesn't walk down all SynPats #13114 (SynPat.Record / QuoteExpr traversal) — all CI passes, all review threads resolved — Review
• Review/Merge PR Fix #12386, SRTP trait call correct overload resolution in multi-submit FSI scenario #19471: Fix Null value returned from trait call #12386 — SRTP trait call correct overload resolution in multi-submit FSI — CI passes, no reviews yet — Review
• Close PR Add regression test: #12796, DefaultValue null on array type record field #19472: regression test for internal error : encodeCustomAttrElemType: unrecognized custom element type #12796 — bug confirmed NOT fixed on Desktop .NET Framework; T-Gro flagged the test as wrong — Review
• Merge PR Add regression test: #10043, backtick should not report unexpected keyword #19476: regression test for Unexpected keyword error when there's no keyword #10043 (backtick/at-sign/bang in type annotations) — CI now fully passing after workflow approval; ready for merge — Review
• Close PR Add regression test: #16154, task CE with IQueryable filters no longer throws VerificationException #19530: regression test for VerificationException on runtime, due to upcast to obj inside the task state machine #16154 — Regression PR Shepherd confirmed issue NOT fixed on Desktop .NET Framework; AI-thinks-issue-fixed label already removed from VerificationException on runtime, due to upcast to obj inside the task state machine #16154 — Review
• Verify and close Expression tree with anonymous type created incorrectly #11127: expression tree with anonymous records — confirmed fixed with FSharp.Core 11.0.100 (PR FSharp.Core 'query' related fixes #19243), existing test coverage at FSharpQuotations.fs#L265-L303. T-Gro confirmed on April 1 — View
• Check comment on Using delegate keyword breaks semantic highlighting #16982: AI-thinks-windows-only removed — semantic highlighting with delegate keyword still broken, reproduced via FCS — View
• Check comment on SNAFU with indexed properties & type extensions: internal error & inconsistency over shadowing #16034: confirmed still present — indexed property setter with named arg gives FS0193 — View
• Check comment on Signature mismatch with no comparable struct #15339: confirmed still present — GenerateSignature() drops [] and [] attributes — View
• Check comment on Can't use addition (substruction) multiple times in member for constrained to INumber<> generic  #16464: confirmed still present — FS0670 when chaining multiple + on INumber<> — View
• Check comment on Internal error when using custom attribute and omitting optional argument #8353: root cause identified — optional bool attribute arg without DefaultParameterValue causes internal error (now assigned to T-Gro/Copilot) — View
• Check comment on Completion is available for some obsolete members only #13512: events/fields ignore allowObsolete in ResolveCompletionsInType (now assigned to T-Gro/Copilot) — View
• Issue NOT fixed Can't take address of a struct value and set it to a discard pattern #18841: let _ = &s still raises FS0421 on current main — View

Additional observations for maintainer's attention

• Issue VerificationException on runtime, due to upcast to obj inside the task state machine #16154: Regression PR Shepherd found the task CE / IQueryable VerificationException still occurs on Desktop .NET Framework 4.8 — the CoreCLR-only test was a false positive. The fix may need to address the implicit upcast to obj in the state machine codegen path.
• Issue Using delegate keyword breaks semantic highlighting #16982: Delegate semantic highlighting bug confirmed via FCS GetSemanticClassification. The entire delegate signature is classified as Method (from the synthetic Invoke member), and bare int keywords don't get ValueType classification — only fully-qualified System.Int32 does.
• Issue Expression tree with anonymous type created incorrectly #11127: Fix is in FSharp.Core (PR FSharp.Core 'query' related fixes #19243), not the compiler. Will ship with next SDK. Existing test coverage at FSharpQuotations.fs#L265-L303.
• Issue duplicate entry '.cctor' in method table #19445 (duplicate .cctor in method table for generic DU with static member val) — confirmed still present in F# 11.0 dev.
• Issues Internal error when using custom attribute and omitting optional argument #8353 and Completion is available for some obsolete members only #13512 are now assigned to T-Gro/Copilot — Copilot Coding Agent may be working on fixes.
• PR Add regression test: #10043, backtick should not report unexpected keyword #19476: The Regression PR Shepherd hit persistent protected-file push restrictions (9 attempts on Apr 8-9). A maintainer approved the workflow run and CI is now passing. Ready for merge.

Future Work for Repo Assist

• Task 1: Continue scanning pre-2024 bugs with new activity (c=0, uses lr filter — currently no candidates)
• Task 3: woc=18119 — all windows-only issues reassessed; monitoring for newly labeled issues
• Task 2: rtc=19456 — monitoring for newly labeled AI-thinks-issue-fixed issues

Run History

2026-04-09 12:53 UTC — Run

• 📋 Task 1: No pre-2024 bugs with new activity since 2026-04-09 (lr filter); no candidates
• 📋 Task 3: woc=18119 — no windows-only issues above cursor; all previously assessed
• 📋 Task 2: rtc=19456 — Expression tree with anonymous type created incorrectly #11127 already handled (Outcome 1); no new AI-thinks-issue-fixed issues
• 📝 Updated monthly summary: PR Add regression test: #10043, backtick should not report unexpected keyword #19476 CI now fully passing after workflow approval — ready for merge

2026-04-09 00:54 UTC — Run

• 📋 Task 1: No pre-2024 bugs with new activity since 2026-04-08 (lr filter); no candidates
• 📋 Task 3: woc=18119 — no windows-only issues above cursor; all previously assessed
• 📋 Task 2: rtc=19456 — Expression tree with anonymous type created incorrectly #11127 already handled (Outcome 1); no new AI-thinks-issue-fixed issues
• 📝 Updated monthly summary: noted Add regression test: #10043, backtick should not report unexpected keyword #19476 persistent merge conflict/push failures, Internal error when using custom attribute and omitting optional argument #8353/Completion is available for some obsolete members only #13512 assigned to Copilot

2026-04-08 12:51 UTC — Run

• 📋 Task 1: No pre-2024 bugs with new activity since 2026-04-01 (lr filter); no candidates
• 📋 Task 3: woc=18119 — no windows-only issues above cursor; all previously assessed
• 📋 Task 2: rtc=19456 — Expression tree with anonymous type created incorrectly #11127 already handled (Outcome 1); no new AI-thinks-issue-fixed issues
• 📝 Updated monthly summary: refreshed PR statuses (Add regression test: #16154, task CE with IQueryable filters no longer throws VerificationException #19530 confirmed not-fixed by PR Shepherd, Add regression test: #13114, SynPat.Record and QuoteExpr traversal #19468 ready to merge, Add regression test: #12796, DefaultValue null on array type record field #19472 CI failing)

2026-04-01 12:49 UTC — Run

• 🏷️ Labelled Expression tree with anonymous type created incorrectly #11127 with AI-thinks-issue-fixed (expression tree with anonymous records — confirmed fixed with local FSharp.Core 11.0.100)
• 💬 Commented on Expression tree with anonymous type created incorrectly #11127: confirmed fix, linked existing test coverage at FSharpQuotations.fs#L265-L303
• 🏷️ Removed AI-thinks-issue-fixed from Null value returned from trait call #12386 (false positive — humans confirmed still repros in multi-submit FSI)
• 💬 Commented on Null value returned from trait call #12386: acknowledged false positive, noted fix PR Fix #12386, SRTP trait call correct overload resolution in multi-submit FSI scenario #19471 in progress
• 🏷️ Removed AI-thinks-windows-only from Using delegate keyword breaks semantic highlighting #16982 (semantic highlighting testable via FCS)
• 💬 Commented on Using delegate keyword breaks semantic highlighting #16982: reproduced delegate classification bug via FCS, full evidence provided
• 📋 Task 3: Confirmed Intellisense commiting on characters including ', ;, " #17280, Visual Studio selects the highest version of the sdk installed on the machine when executing scripts in FSI #17307, VS2022 F# Interactive output pane interspersing empty lines at random on large text output #18064, F# VisualStudio 2022 text editor erases pipe of array expression closing bracket when issuing match in a for loop #18119 correctly labeled windows-only; woc updated to 18119
• ✅ Merged today by maintainers: PRs Add regression test: #9878, SRTP with phantom type parameter #19467, Add regression test: #7177, never-matched warning FS0026 with active patterns #19528, Add regression test: #16007, SRTP ctor constraint no longer causes value restriction #19529, Add regression test: #19456, nested let bang in plain let inside task CE raises FS0750 #19531, Add regression test: #16056, auto property DeclarationLocation returns correct range #19533, Add regression test: #15070, hash-load with dot-slash prefix no longer causes FS1141 #19534, Add regression test: #15987, SRTP overload resolution returns correct typed value #19535 (7 regression test PRs + Fix FS0452 for empty string pattern matching in quotations #19532 FS0452 fix)

2026-04-01 07:02 UTC — Run

• 📋 Task 1: No pre-2024 bugs with new activity since last run; FS3356 Extension members #19539 (FS3356 extension members) created today — post-2024 cutoff, skipped
• 📋 Task 3: Confirmed Telemetry exception in VS #16083, VS Coloring sometimes resets #16130, Exception in VS in itemKeyStore  #16275, Make sure color themes handling in VS is up to date #16300, Comments get decolorized in some newly created projects #16886 correctly labeled AI-thinks-windows-only (telemetry/VS-chrome issues); woc updated to 16886
• 📋 Task 2: No new AI-thinks-issue-fixed issues above rtc=19456; no action
• 📝 Noted Fix FS0452 for empty string pattern matching in quotations #19532 (T-Gro fix for FS0452 quotation issue Quotation string matching fails? #19527) added to Suggested Actions

2026-04-01 01:07 UTC — Run

• 📋 No pre-2024 bugs with new activity since 2026-03-31 (lr filter, all candidates already processed)
• 📋 No new AI-thinks-windows-only issues above woc=15350 — Task 3 idle
• 📋 No new AI-thinks-issue-fixed issues above rtc=19456 — Task 2 idle
• 📝 Created April 2026 monthly activity summary (this issue)

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🤖 Repo Assist here — I'm an automated AI assistant for this repository.

Activity for April 2026

Suggested Actions for Maintainer

Comprehensive list of all pending actions requiring maintainer attention:

• Merge PR Add regression test: #13114, SynPat.Record and QuoteExpr traversal #19468: regression test for defaultTraverse for SynPat in SyntaxTraverse.Traverse doesn't walk down all SynPats #13114 (SynPat.Record / QuoteExpr traversal) — all CI passes, review comments addressed — Review
• Review/Merge PR Fix #12386, SRTP trait call correct overload resolution in multi-submit FSI scenario #19471: Fix Null value returned from trait call #12386 — SRTP trait call correct overload resolution in multi-submit FSI — CI clean, mergeable — Review
• Close PR Add regression test: #12796, DefaultValue null on array type record field #19472: regression test for internal error : encodeCustomAttrElemType: unrecognized custom element type #12796 — bug confirmed NOT fixed on Desktop .NET Framework; T-Gro flagged the test as wrong — Review
• Verify and close Expression tree with anonymous type created incorrectly #11127: expression tree with anonymous records — confirmed fixed with FSharp.Core 11.0.100 (PR FSharp.Core 'query' related fixes #19243), existing test coverage at FSharpQuotations.fs#L265-L303. T-Gro confirmed on April 1 — View
• Check comment on Using delegate keyword breaks semantic highlighting #16982: AI-thinks-windows-only removed — semantic highlighting with delegate keyword still broken, reproduced via FCS — View
• Check comment on SNAFU with indexed properties & type extensions: internal error & inconsistency over shadowing #16034: confirmed still present — indexed property setter with named arg gives FS0193 — View
• Check comment on Signature mismatch with no comparable struct #15339: confirmed still present — GenerateSignature() drops [] and [] attributes — View
• Check comment on Can't use addition (substruction) multiple times in member for constrained to INumber<> generic  #16464: confirmed still present — FS0670 when chaining multiple + on INumber<> — View
• Check comment on Internal error when using custom attribute and omitting optional argument #8353: root cause identified — optional bool attribute arg without DefaultParameterValue causes internal error (now assigned to T-Gro/Copilot) — View
• Check comment on Completion is available for some obsolete members only #13512: events/fields ignore allowObsolete in ResolveCompletionsInType (now assigned to T-Gro/Copilot) — View
• Issue NOT fixed Can't take address of a struct value and set it to a discard pattern #18841: let _ = &s still raises FS0421 on current main — View

Additional observations for maintainer's attention

• Issue VerificationException on runtime, due to upcast to obj inside the task state machine #16154: Regression PR Shepherd found the task CE / IQueryable VerificationException still occurs on Desktop .NET Framework 4.8 — the CoreCLR-only test was a false positive. The fix may need to address the implicit upcast to obj in the state machine codegen path. PR Add regression test: #16154, task CE with IQueryable filters no longer throws VerificationException #19530 was merged as a CoreCLR-only regression test.
• Issue Using delegate keyword breaks semantic highlighting #16982: Delegate semantic highlighting bug confirmed via FCS GetSemanticClassification. The entire delegate signature is classified as Method (from the synthetic Invoke member), and bare int keywords don't get ValueType classification — only fully-qualified System.Int32 does.
• Issue Expression tree with anonymous type created incorrectly #11127: Fix is in FSharp.Core (PR FSharp.Core 'query' related fixes #19243), not the compiler. Will ship with next SDK. Existing test coverage at FSharpQuotations.fs#L265-L303.
• Issue duplicate entry '.cctor' in method table #19445 (duplicate .cctor in method table for generic DU with static member val) — confirmed still present in F# 11.0 dev.
• Issues Internal error when using custom attribute and omitting optional argument #8353 and Completion is available for some obsolete members only #13512 are now assigned to T-Gro/Copilot — Copilot Coding Agent may be working on fixes.
• Issue Compiler allows us to box a byreflike type, leading to runtime crash #7114: Compiler allows boxing a byref-like type (Span<int>.Empty.GetType()), which compiles without error but crashes at runtime with InvalidProgramException: Cannot create boxed ByRef-like values. Confirmed still present on F# 15.2.101.0 / F# 11.0.
• Issue Incorrect error message when mixing struct/reference anonymous records #6110: Error message for mixing struct/reference anonymous records still says "One tuple type is a struct tuple, the other is a reference tuple" — should mention anonymous records instead.

Future Work for Repo Assist

• Task 1: Continue scanning pre-2024 bugs with new activity (c=0, uses lr filter — currently no candidates)
• Task 3: woc=18119 — all windows-only issues reassessed; monitoring for newly labeled issues
• Task 2: rtc=19456 — monitoring for newly labeled AI-thinks-issue-fixed issues

Run History

2026-04-10 12:50 UTC — Run

• 📋 Task 1: c=0, investigated 7 pre-2024 bugs — all confirmed still present (Calling curried static functions of types inside a "namespace rec" raises warning FS0040 #7451, Incorrect error message when mixing struct/reference anonymous records #6110, Compiler allows us to box a byreflike type, leading to runtime crash #7114, Warning FS0044 (type abbreviation to a less accessible type) should not be incorrectly triggered when using signature files #3998, bogus "Incomplete pattern matches on this expression" warning on total active pattern. #8137, Error FS0001 instead of FS0249 for overlapped names #4601, Pseudo namespace "global" fails when used with specifying record fields, and acts odd with DU fields #10282)
• 📋 Task 3: woc=18119 — no windows-only issues above cursor
• 📋 Task 2: rtc=19456 — no new AI-thinks-issue-fixed issues
• 📝 Updated monthly summary: PRs Add regression test: #10043, backtick should not report unexpected keyword #19476 and Add regression test: #16154, task CE with IQueryable filters no longer throws VerificationException #19530 merged since last update; removed from suggested actions. Added observations on Compiler allows us to box a byreflike type, leading to runtime crash #7114 (byref-like boxing) and Incorrect error message when mixing struct/reference anonymous records #6110 (wrong error message)

2026-04-09 12:53 UTC — Run

• 📋 Task 1: No pre-2024 bugs with new activity since 2026-04-09 (lr filter); no candidates
• 📋 Task 3: woc=18119 — no windows-only issues above cursor; all previously assessed
• 📋 Task 2: rtc=19456 — Expression tree with anonymous type created incorrectly #11127 already handled (Outcome 1); no new AI-thinks-issue-fixed issues
• 📝 Updated monthly summary: PR Add regression test: #10043, backtick should not report unexpected keyword #19476 CI now fully passing after workflow approval — ready for merge

2026-04-09 00:54 UTC — Run

• 📋 Task 1: No pre-2024 bugs with new activity since 2026-04-08 (lr filter); no candidates
• 📋 Task 3: woc=18119 — no windows-only issues above cursor; all previously assessed
• 📋 Task 2: rtc=19456 — Expression tree with anonymous type created incorrectly #11127 already handled (Outcome 1); no new AI-thinks-issue-fixed issues
• 📝 Updated monthly summary: noted Add regression test: #10043, backtick should not report unexpected keyword #19476 persistent merge conflict/push failures, Internal error when using custom attribute and omitting optional argument #8353/Completion is available for some obsolete members only #13512 assigned to Copilot

2026-04-08 12:51 UTC — Run

• 📋 Task 1: No pre-2024 bugs with new activity since 2026-04-01 (lr filter); no candidates
• 📋 Task 3: woc=18119 — no windows-only issues above cursor; all previously assessed
• 📋 Task 2: rtc=19456 — Expression tree with anonymous type created incorrectly #11127 already handled (Outcome 1); no new AI-thinks-issue-fixed issues
• 📝 Updated monthly summary: refreshed PR statuses (Add regression test: #16154, task CE with IQueryable filters no longer throws VerificationException #19530 confirmed not-fixed by PR Shepherd, Add regression test: #13114, SynPat.Record and QuoteExpr traversal #19468 ready to merge, Add regression test: #12796, DefaultValue null on array type record field #19472 CI failing)

2026-04-01 12:49 UTC — Run

• 🏷️ Labelled Expression tree with anonymous type created incorrectly #11127 with AI-thinks-issue-fixed (expression tree with anonymous records — confirmed fixed with local FSharp.Core 11.0.100)
• 💬 Commented on Expression tree with anonymous type created incorrectly #11127: confirmed fix, linked existing test coverage at FSharpQuotations.fs#L265-L303
• 🏷️ Removed AI-thinks-issue-fixed from Null value returned from trait call #12386 (false positive — humans confirmed still repros in multi-submit FSI)
• 💬 Commented on Null value returned from trait call #12386: acknowledged false positive, noted fix PR Fix #12386, SRTP trait call correct overload resolution in multi-submit FSI scenario #19471 in progress
• 🏷️ Removed AI-thinks-windows-only from Using delegate keyword breaks semantic highlighting #16982 (semantic highlighting testable via FCS)
• 💬 Commented on Using delegate keyword breaks semantic highlighting #16982: reproduced delegate classification bug via FCS, full evidence provided
• 📋 Task 3: Confirmed Intellisense commiting on characters including ', ;, " #17280, Visual Studio selects the highest version of the sdk installed on the machine when executing scripts in FSI #17307, VS2022 F# Interactive output pane interspersing empty lines at random on large text output #18064, F# VisualStudio 2022 text editor erases pipe of array expression closing bracket when issuing match in a for loop #18119 correctly labeled windows-only; woc updated to 18119
• ✅ Merged today by maintainers: PRs Add regression test: #9878, SRTP with phantom type parameter #19467, Add regression test: #7177, never-matched warning FS0026 with active patterns #19528, Add regression test: #16007, SRTP ctor constraint no longer causes value restriction #19529, Add regression test: #19456, nested let bang in plain let inside task CE raises FS0750 #19531, Add regression test: #16056, auto property DeclarationLocation returns correct range #19533, Add regression test: #15070, hash-load with dot-slash prefix no longer causes FS1141 #19534, Add regression test: #15987, SRTP overload resolution returns correct typed value #19535 (7 regression test PRs + Fix FS0452 for empty string pattern matching in quotations #19532 FS0452 fix)

2026-04-01 07:02 UTC — Run

• 📋 Task 1: No pre-2024 bugs with new activity since last run; FS3356 Extension members #19539 (FS3356 extension members) created today — post-2024 cutoff, skipped
• 📋 Task 3: Confirmed Telemetry exception in VS #16083, VS Coloring sometimes resets #16130, Exception in VS in itemKeyStore  #16275, Make sure color themes handling in VS is up to date #16300, Comments get decolorized in some newly created projects #16886 correctly labeled AI-thinks-windows-only (telemetry/VS-chrome issues); woc updated to 16886
• 📋 Task 2: No new AI-thinks-issue-fixed issues above rtc=19456; no action
• 📝 Noted Fix FS0452 for empty string pattern matching in quotations #19532 (T-Gro fix for FS0452 quotation issue Quotation string matching fails? #19527) added to Suggested Actions

2026-04-01 01:07 UTC — Run

• 📋 No pre-2024 bugs with new activity since 2026-03-31 (lr filter, all candidates already processed)
• 📋 No new AI-thinks-windows-only issues above woc=15350 — Task 3 idle
• 📋 No new AI-thinks-issue-fixed issues above rtc=19456 — Task 2 idle
• 📝 Created April 2026 monthly activity summary (this issue)

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