[Repo Assist] Monthly Activity 2026-03

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Activity for March 2026

Suggested Actions for Maintainer

Comprehensive list of all pending actions requiring maintainer attention:

• Check comment on SRTP Regression in .net SDK release 7.0.400 #15987: Repo Assist labelled AI-thinks-issue-fixed — SRTP regression with FSharpPlus monad fixed in F# 11.0 — verify and close — View
• Check comment on FSharpMemberOrFunctionOrValue.DeclarationLocation returns wrong location for auto property #16056: Repo Assist labelled AI-thinks-issue-fixed — DeclarationLocation for auto-property now correctly returns Prop range — verify and close — View
• Check comment on #load in fsx script can fail without a proper error message #15070: Repo Assist labelled AI-thinks-issue-fixed — #load "./path/script.fsx" no longer gives FS1141 — verify and close — View
• Check comment on Can't take address of a struct value and set it to a discard pattern #18841: Repo Assist labelled AI-thinks-issue-fixed — let _ = &s on struct no longer raises FS0421 — verify and close — View
• Check comment on Missing FS0750 in nested let bang (got lost between 9.0 and 10.0) #19456: Repo Assist labelled AI-thinks-issue-fixed — missing FS0750 for nested let! inside plain let in task CE fixed in F# 11.0 dev — verify and close — View
• Check comment on Lang version 6.0 -> 7.0 value restriction regression. #16007: Repo Assist labelled AI-thinks-issue-fixed — value restriction regression fixed in F# 8.0+ — verify and close — View
• Check comment on VerificationException on runtime, due to upcast to obj inside the task state machine #16154: Repo Assist labelled AI-thinks-issue-fixed — task state machine VerificationException fixed — verify and close — View
• Check comment on "This rule is never matched" warning is not shown if an active pattern is used in match expression #7177: Repo Assist labelled AI-thinks-issue-fixed — "This rule is never matched" warning now correctly raised even with active patterns — verify and close — View
• Check comment on No indentation warning is given when a hash directive is used inside a nested module #3841: Repo Assist labelled AI-thinks-issue-fixed — hash directive indentation now raises FS0010 + FS0058 in F# 10.0 — verify and close — View
• Check comment on Symbols API: Empy value is returned for auto-property binding #3939: Repo Assist labelled AI-thinks-issue-fixed — auto-property now returned with IsProperty: true and correct DeclaringEntity — verify and close — View
• Check comment on Unexpected keyword error when there's no keyword #10043: Repo Assist labelled AI-thinks-issue-fixed — error messages for backtick/tilde in type expressions now use FS3563 — verify and close — View
• Check comment on SRTP committed overload does not match expected overload #12064: Repo Assist labelled AI-thinks-issue-fixed — SRTP committed overload mismatch fixed — verify and close — View
• Check comment on Mutually recursive non-function values with intermediate module definition not initialized incorrectly #12384: Repo Assist labelled AI-thinks-issue-fixed — mutually recursive values no longer initialized as null — verify and close — View
• Check comment on Null value returned from trait call #12386: Repo Assist labelled AI-thinks-issue-fixed — null value returned from SRTP trait call regression now fixed — verify and close — View
• Check comment on When using EntryPoint attribute in fsx script top-level code is not executed #13350: Repo Assist labelled AI-thinks-issue-fixed — [] in fsx scripts now correctly executes top-level code — verify and close — View
• Check comment on In Visual Studio: Renaming operator with . only renames right of . #14057: Repo Assist labelled AI-thinks-issue-fixed — Rename operator with . fixed by PR Find All References and Rename Symbol Bug Fixes #19252 — verify and close — View
• Check comment on "land" reserved keyword error message  #6715: Repo Assist labelled AI-thinks-issue-fixed — land/lor etc. no longer reserved in F# 10.0 — verify and close — View
• Check comment on NullReferenceException when calling a virtual Object method on a value type from inline function #8098: Repo Assist labelled AI-thinks-issue-fixed — NullReferenceException via SRTP on value type fixed by PR Resolve ILVerify errors — adjust codegen (551 → 56 errors) #19372 — verify and close — View
• Check comment on Unexpected warning '[FS3511] This state machine is not statically compilable' #12839: Repo Assist labelled AI-thinks-issue-fixed — FS3511 state machine warning fixed by PR Improve static compilation of state machines #19297 — verify and close — View
• Check comment on Expression tree with anonymous type created incorrectly #11127: Repo Assist labelled AI-thinks-issue-fixed — anonymous record expression tree Lambda.Invoke bug fixed by PR FSharp.Core 'query' related fixes #19243 — verify and close — View
• Check comment on FS0267 trying to concatenate string in an attribute value with --checked+ #11398: Repo Assist labelled AI-thinks-issue-fixed — FS0267 with --checked+ and string concat in attribute values now compiles — verify and close — View
• Check comment on internal error : encodeCustomAttrElemType: unrecognized custom element type #12796: Repo Assist labelled AI-thinks-issue-fixed — generic record type in typeof<> attribute argument now compiles — verify and close — View
• Check comment on No description is provided for a completion item with a quote in its name #13194: Repo Assist commented — XPath quote bug fixed — verify and close — View
• Remove incorrect label on use binding for IAsyncDisposable not supported in F# interactive #14454: Repo Assist previously labelled AI-thinks-issue-fixed but T-Gro (2026-03-24) confirmed still broken in F# 11.0 — remove label — View
• Reconsider label on Error using type abbreviation for attribute #7877: Repo Assist labelled AI-thinks-issue-fixed but T-Gro confirmed FS0033 error is still wrong — consider removing the label — View
• Check comment on defaultTraverse for SynPat in SyntaxTraverse.Traverse doesn't walk down all SynPats #13114: Repo Assist labelled AI-thinks-issue-fixed — SynPat.Record and SynPat.QuoteExpr now handled in defaultTraverse — verify and close — View
• Check comment on Later errors obscure earlier errors  #13697: Repo Assist labelled AI-thinks-issue-fixed — typeof(T) in attribute context now correctly shows FS0039 — verify and close — View
• Check comment on internal error: no 'value__' field found for enumeration type when rec module & enum constraint & type alias #14580: Repo Assist labelled AI-thinks-issue-fixed — FS0073: internal error: no 'value__' field found in module rec replaced with proper FS0033 — verify and close — View
• Check comment on Error number 3217 is reused for two errors  #15655: Repo Assist labelled AI-thinks-issue-fixed — packageManagerError renumbered — verify and close — View
• Check comment on Spurious FS3570 warning with Active Pattern #16410: Repo Assist labelled AI-thinks-issue-fixed — spurious FS3570 warning with Active Pattern fixed by PR Bugfix for DotLambda - (a, (b, c)) was incorrectly detected as a discard (a compiler generated one was there) #16334 — verify and close — View
• Check comment on Symbols API: FSharpEntity.IsByRef is false for byref`1 #3532: Repo Assist labelled AI-thinks-issue-fixed — FSharpEntity.IsByRef now returns true for byref<'T> — verify and close — View
• Check comment on Stress test on type system involving many statically resolved type parameters #9382: Repo Assist labelled AI-thinks-issue-fixed — SRTP stress test FS0073 now compiles correctly — verify and close — View
• Check comment on Undefined or unsolved type variable #9878: Repo Assist labelled AI-thinks-issue-fixed — SRTP undefined type variable now resolved — verify and close — View
• Check comment on Units of Measure applied to literal bindings are ignored #6929: Repo Assist labelled AI-thinks-issue-fixed — Units of Measure now preserved on literal bindings — verify and close — View
• Check comment on Finding references / renaming doesn't work for active patterns in signature files #14969: Repo Assist labelled AI-thinks-issue-fixed — finding references/renaming for active patterns in sig files fixed by PR Find All References and Rename Symbol Bug Fixes #19252 — verify and close — View
• Check comment on Problem consuming C# API with default value for parameter #13519: Repo Assist labelled AI-thinks-issue-fixed — C# API with optional param + ParamArray now callable — verify and close — View
• Check comment on Internal error when using custom attribute and omitting optional argument #8353: Repo Assist commented with root cause and one-line fix — optional bool attribute arg without DefaultParameterValue causes internal error — implement fix in IlxGen.fs — View
• Check comment on Needless allocations on invocation of array of functions #3660: Repo Assist labelled AI-thinks-issue-fixed — needless closure allocations for indexed for loop now 0 bytes — verify and close — View
• Check comment on FS2014 when using tupled args #6379: Repo Assist confirmed FS2014 still present in F# 10.0 — View
• Check comment on Protected member inaccessible #5302: Repo Assist confirmed protected field FS1097 via closure still present in F# 10.0 — View
• Check comment on Update signature generation to include Sealed/Class/Interface attribute for OO-style type constructs #14308: Repo Assist labelled AI-thinks-issue-fixed — signature generation now emits [] — verify and close — View
• Check comment on Signature generation must include private field info in case of Structs #14310: Repo Assist labelled AI-thinks-issue-fixed — private struct fields included in generated .fsi — verify and close — View
• Check comment on Signature file generation chops off leading FSharp. prefix for externally-defined code #12067: Repo Assist labelled AI-thinks-issue-fixed — FSharp. prefix no longer stripped in generated .fsi — verify and close — View
• Check comment on Completion is available for some obsolete members only #13512: Repo Assist identified root cause — events/fields ignore allowObsolete in ResolveCompletionsInType — View
• Check comment on 'No matching overload' error has too wide range #14284: Repo Assist confirmed still present — overload error range issue — View
• Check comment on CLIEvent events are considered properties in XmlDoc Ids and Symbol API #10273: Repo Assist confirmed still present in F# 10.0 — CLIEvent IsEvent=false — View
• Check comment on Methods are not tagged as methods in tooltips #10540: Repo Assist confirmed still present in F# 10.0 — IsMethod=false for methods — View
• Check comment on Nested module attribute is not resolved in recursive namespace #7931: Repo Assist confirmed still present in F# 10.0 — [] in namespace rec gives FS0039 — View
• Check comment on Wrong expression is ignored warning range #5418: Repo Assist confirmed FS0020 warning range spans whole loop body — still present in F# 10.0 — View
• Check comment on Bitwise or on a char enum should error at compile time #11785: Repo Assist confirmed still present — [<Obsolete>] on module not reported — View
• Check comment on Values inside 'as' patterns are disposed multiple times #12300: Repo Assist confirmed still present — double-nested anon record FS0001 — View
• Check comment on Unused binding warning isn't reported for recursive binding in a type #13849: Repo Assist confirmed still present — SRTP+task FS0193 internal error — View
• Check comment on Duplicate member signature error is not reported in signature files #13981: Repo Assist confirmed still present — implicit yield-bang false positive — View
• Check comment on In FSI, an invalid string literal can break further parsing of string in that interactive session #14160: Repo Assist confirmed still present — typeof<_> misleading FS0001 — View
• Check comment on F# 7.0 generate incorrect program in release config. #14492: Repo Assist confirmed still present — TypeLoadException with inline+struct constraint — View
• Check comment on nativeptr in interfaces leads to runtime errors #14508: Repo Assist confirmed still present — nativeptr in interface TypeLoadException — View

Additional observations for maintainer's attention

Issue #19445 (duplicate .cctor in method table for generic DU with static member val) — confirmed still present in F# 11.0 dev (fsi 15.2.100.0, commit a0cce49). type U<'T> = | A with static member val X = 3 gives internal error FS0192. Workaround: use | A of unit instead.

Issue #18849 (wrong type in type mismatch error: let a, b: int = () says "here has type 'int'" instead of 'unit') — confirmed still present in F# 11.0 dev (fsi 15.2.100.0).

Issue #16189 (TryFinallyAsync ignores exceptions from DisposeAsync) — confirmed still present in F# 11.0 (fsi v15.2.100.0, commit a0cce49): a class implementing both IDisposable and IAsyncDisposable used in task { use _ = disposable } does not propagate exceptions thrown in DisposeAsync. The issue has a proposed fix in its body.

Issue #14492 (TypeLoadException in Release config) — confirmed still present in F# 11.0 (bootstrap fsi v15.2.100.0, commit a0cce49, 2026-03-27): memoizeLatestRef using inline with not struct constraint throws TypeLoadException in Release (works in Debug). Cross-platform (reproduced on Linux/net10.0).

Issue #14508 (nativeptr in interfaces) — confirmed still present in F# 11.0 (commit a0cce49): non-generic class implementing IFoo (generic interface with nativeptr<'T> member) throws TypeLoadException at runtime on both Linux and Windows; the generic-class variant Working<'T> works fine. Cross-platform bug (reproduced on Linux/net10.0).

Issue #14454 (use for IAsyncDisposable in task CE in FSI) — Repo Assist previously labelled as fixed; T-Gro (2026-03-24) confirmed the bug persists in F# 11.0. The root cause is FSI loading netstandard2.0 FSharp.Core which has IAsyncDisposable overload gated behind #if NETSTANDARD2_1. The AI-thinks-issue-fixed label should be removed.

Issue #14437 (Confusing type mismatch message in async CE) — confirmed still present in F# 11.0 (fsi v15.2.100.0): using return! where return is expected gives "This expression was expected to have type unit" rather than pointing to the return!.

Issue #15843 (FSharpType.Format for Units of Measure) — confirmed still present in F# 11.0 (fsi 15.2.100.0, commit a0cce49): 42<_> and 42<1> both display as int (UoM lost). Products print with space instead of *.

Issue #16099 (MembersFunctionsAndValues returns no auto property for interface impl) — confirmed still present in F# 11.0: member val P1 = 1 with get, set in an interface implementation returns two separate accessor symbols (both IsProperty: false) rather than the property itself.

Future Work for Repo Assist

• Continue scanning 2023–2024 bugs from cursor ~remove duplicate entry of DebugPoint AP in Exprs.fsi #16100 (issues not yet assessed)
• Follow up on older pre-2023 bugs confirmed present (write clean repros)

Run History

2026-03-30 01:03 UTC — Run

• 💬 Commented on SRTP Regression in .net SDK release 7.0.400 #15987: confirmed SRTP regression with FSharpPlus fixed in F# 11.0 (commit a0cce49)
• 🏷️ Labelled SRTP Regression in .net SDK release 7.0.400 #15987 with AI-thinks-issue-fixed
• 💬 Commented on FSharpMemberOrFunctionOrValue.DeclarationLocation returns wrong location for auto property #16056: confirmed DeclarationLocation for auto-property now returns Prop range (not get) in F# 11.0
• 🏷️ Labelled FSharpMemberOrFunctionOrValue.DeclarationLocation returns wrong location for auto property #16056 with AI-thinks-issue-fixed
• 🔍 Confirmed still present in F# 11.0: Static abstracts implemented/inherited in another interface don't work #15992 (static abstracts in interface), FSharpType.Format for Units Of Measure gives unexpected results #15843 (UoM Format), MembersFunctionsAndValues returns no auto property symbol in interface implementation #16099 (MembersFunctionsAndValues auto-property)

2026-03-29 18:46 UTC — Run

• 💬 Commented on #load in fsx script can fail without a proper error message #15070: confirmed #load "./path/script.fsx" no longer gives FS1141 — fixed in F# 10.0
• 🏷️ Labelled #load in fsx script can fail without a proper error message #15070 with AI-thinks-issue-fixed
• 🔍 Confirmed still present: try catch inside of task does not compile correctly, requires return value even if exception is thrown #15419, %+f printf format specifier adds both plus and minus for negative zero (-0) on .NET Core #15557, printf format specifier with zero padding behaves incorrectly for negative zero (-0.0) on .NET Core #15558, FS3559 triggers on query expressions #16455, Cannot use base as identifier in a class, even double-backticked #16482, AttributeUsage.AllowMultiple is not inherited for attributes defined (subclassed) in C# #17107, Compiler allows non-functions to be bound to active pattern names #17190

2026-03-29 12:46 UTC — Run

• 💬 Commented on Can't take address of a struct value and set it to a discard pattern #18841: confirmed let _ = &s on struct fixed — no FS0421 in SDK 10.0.105 + fsi 15.2.100.0
• 🏷️ Labelled Can't take address of a struct value and set it to a discard pattern #18841 with AI-thinks-issue-fixed
• 💬 Commented on Missing FS0750 in nested let bang (got lost between 9.0 and 10.0) #19456: confirmed missing FS0750 regression (silent let! as let) fixed in F# 11.0 dev (fsi 15.2.100.0)
• 🏷️ Labelled Missing FS0750 in nested let bang (got lost between 9.0 and 10.0) #19456 with AI-thinks-issue-fixed

2026-03-29 06:48 UTC — Run

• 🔍 Scanned pre-2023 bugs (~Error message "This function takes too many arguments..." can be improved #5132–Signature mismatch with no comparable struct #15339) — build from source OOM (container memory limit)
• 🔍 Confirmed still present in F# 10.0 (SDK 10.0.105): Struct member access inside quotation gives compile error  #6293, [<Literal>] references fail in recursive modules #6338, Error message "This function takes too many arguments..." can be improved #5132, Error constructing struct record in member using 'with' #7536, bogus "Incomplete pattern matches on this expression" warning on total active pattern. #8137, Returning a voidptr option throws at runtime #9994, Pseudo namespace "global" fails when used with specifying record fields, and acts odd with DU fields #10282, Calling protected static base member from static do raises MethodAccessException #11929, Recursive type with a legal Zero value fails to compile #12379, Incorrect error message with applicative Computation Expressions  #12607, Type Inference Regression #12929, Confusing/incorrect type mismatch message in async CE #14437
• 🔍 Compiler doesn't accept methods with overloaded nativeptr variants #7428 (nativeptr overloads): fix in source (TypedTreeOps.fs:801-803) but not yet in SDK 10.0.105

2026-03-29 01:00 UTC — Run

• 🔍 Scanned post-2023 bugs DotnetFscCompilerPath property is wrapped into double quotes #16375–ActivePatterns: Compilation issues (memory and speed) #18425 (Nov 2023–Mar 2025) using F# Interactive 14.0.105.0 / F# 10.0 (SDK 10.0.105, commit a0cce49)
• 🔍 Confirmed still present: Parenthesized/double unit literal () → (()) required in certain scenarios #16254, Incorrect codegen for Debug build with srtp and mutable struct #16292, Cannot supply typeof<> to attribute constructor #16344, NullReferenceException with Debug build and recursive reference #16546, Internal error of single case active pattern within let binding #16856, Valid type alias with anonymous record report error #17407, Error FS1113 when creating a class with a class scope self-identifier and an inline member #17899, Hex integer literal has unexpected value #18041, Nested modules defined in the wrong parent module when preceded by a string interpolution (multi line) surrounded with parentheses #18416
• 🔍 Observed FS0193: internal error: startIndex cannot be larger than length of string. (Parameter 'startIndex') #18402 (line directive FS0193 internal error) fixed in F# 10.0 — all 3 repro variants pass

2026-03-28 18:45 UTC — Run

• 💬 Commented on Lang version 6.0 -> 7.0 value restriction regression. #16007: confirmed value restriction regression (langversion:7.0) fixed in F# 8.0+
• 🏷️ Labelled Lang version 6.0 -> 7.0 value restriction regression. #16007 with AI-thinks-issue-fixed
• 💬 Commented on VerificationException on runtime, due to upcast to obj inside the task state machine #16154: confirmed task state machine VerificationException (IQueryable# upcast) fixed in F# 11.0
• 🏷️ Labelled VerificationException on runtime, due to upcast to obj inside the task state machine #16154 with AI-thinks-issue-fixed

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Run Update: 2026-03-20 20:38 UTC — Run

Cycle 8 – Final scan of pre-2023 bugs complete.

Scanned all remaining unlabeled pre-2023 bugs (21 total). Confirmed the following are still genuine open bugs — no changes needed:

• Generic Record Types have different Equality semantics to concrete types #527 — Generic Record Types have different IStructuralEquatable semantics to concrete types (verified reproducible in current F# SDK)
• Identifiers with '@' symbol generate invalid code #1255 — Identifiers with @ symbol generate invalid code — BarAt returns "bar" instead of "hello" (verified reproducible)
• No message reported when a ProvidedType has an ObsoleteAttribute #897 — No ObsoleteAttribute warning on ProvidedType definitions — TODO: provided attributes comment still in AttributeChecking.fs:140
• Type annotation adjacency warning doesn't consider operator names #774, Illegal prefix operators sometimes compile fine, but give confusing errors when applied #792, No diagnostic when custom attributes ignored on unparenthesized tuple type #462, Enum type is lost when used in attribute #995, Access protected const from base class in attribute #3172, Problem: Unlike C#, the F# compiler allows multiple entries of assembly attributes #3548, Async.DefaultCancellationToken susceptible to memory leaks #3590, fsi reference order matter #3600 — all confirmed genuinely open

Also closed duplicate issue #19438 (older "[Repo Assist] Monthly Activity 2026-03").

All pre-2023 bugs are now fully scanned (8 cycles). Next run: move to post-2023 bugs.

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2026-03-21 09:38 UTC — Run

• 🔍 Cycle 22: Scanned all 10 pages (284 pre-2023 bugs, issues Instantiating a generative type provider twice results in invalid IL #37–nativeptr in interfaces leads to runtime errors #14508) — no new fixed/Windows-only candidates found with high confidence
• 🔍 Checked in detail: Unions with 4 or more cases silently fail to utilize UseNullAsTrueValue. #711 (UseNullAsTrueValue/4+ cases, locked), Duplicate cases in match statement not producing compiler warnings if grouped #3448 (duplicate match cases — by-design OR pattern behavior), Compiler allows us to box a byreflike type, leading to runtime crash #7114 (boxing byreflike — still open), [<CompiledName>] ignored on extension properties #9405 (CompiledName on extension properties — still open), Pseudo namespace "global" fails when used with specifying record fields, and acts odd with DU fields #10282 (global namespace with record fields — still open), Calling op_Addition on primitive types doesn't work #14013 (op_Addition on primitives — labeled Resolution-By Design), Syntax error with string interpolation - Unexpected identifier in binding #14394 (string interpolation syntax error — still open)
• 🔍 Cycle 22 complete — proceeding to Cycle 23 next run

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2026-03-23 05:08 UTC — Run

• 🔍 Cycle 55: Pivoted to post-2023 Bug issues — scanned first 50 issues (Jan–Jun 2023, Editor Sticky Scroll not working properly with F# #14542–Invalid error range for special cases of NoEquality types #15518)
• 🔍 Investigated in detail: Type inference in task/backgroundTask CE can lead to "FS0073: internal error: Undefined or unsolved type variable" #14596 (FS0073 in task CE), Too many & and | patterns cause Visual Studio/Ionide to use up all available memory #15086 (memory exhaustion with &/| patterns), try catch inside of task does not compile correctly, requires return value even if exception is thrown #15419 (try/catch in task requiring return), Signature mismatch with no comparable struct #15339 (sig mismatch for no-comparable struct), TypeLoadException using CE applicatives and AOT #15488 (TypeLoadException in CE applicatives with AOT), Incorrect warning for active pattern signature with generic parameters #14736 (FS1189 false warning for active pattern generic params)
• 🔍 No new AI-thinks-issue-fixed or AI-thinks-windows-only candidates found with high confidence in this batch
• 📋 Next run: continue post-2023 scan from Jul 2023+

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