Issues

• Allow F# type parameters to accept byref-like types ('T : allows ref struct)

  fsharp/fslang-suggestions#1476 · Filter by author xperiandri opened on Oct 17, 2026
  1

• Add a HAMT-based persistent HashMap

  area: library
  fsharp/fslang-suggestions#1475 · Filter by author esbenbjerre opened on Sep 29, 2026
  6

• Add a native valueTask { } computation expression to FSharp.Core

  area: library
  fsharp/fslang-suggestions#1474 · Filter by author xperiandri opened on Sep 20, 2026
  11

• ConditionalAutoOpenAttribute

  fsharp/fslang-suggestions#1473 · Filter by author T-Gro opened on Sep 19, 2026
  9

• Support authoring default interface methods (DIMs) in F#

  area: interoparea: object-programmingneeds rfc
  fsharp/fslang-suggestions#1472 · Filter by author Lanayx opened on Sep 14, 2026
  6

• Struct and high arity tuple accessors

  approved-in-principlearea: library
  fsharp/fslang-suggestions#1471 · Filter by author kerams opened on Sep 13, 2026
  13

• Let the explicit upcast operator :> use .NET generic variance

  fsharp/fslang-suggestions#1470 · Filter by author xperiandri opened on Sep 9, 2026
  3

• [Suggestion] Compile-time warning when stackalloc is inlined into a for...in seq loop (hidden try/finally)

  fsharp/fslang-suggestions#1469 · Filter by author Xyncgas opened on Aug 8, 2026
  6

• Addressing inconsistencies and incompleteness in F# string/ToString functions

  fsharp/fslang-suggestions#1468 · Filter by author charlesroddie opened on Jul 2, 2026
  4

• Interop with C# Union Types and Closed Hierarchies

  area: interoparea: unions
  fsharp/fslang-suggestions#1464 · Filter by author T-Gro opened on Mar 23, 2026
  3

• Allow yielding from a do block

  fsharp/fslang-suggestions#1461 · Filter by author charlesroddie opened on Jan 24, 2026
  4

• Add syncTask builder (similar to backgroundTask)

  fsharp/fslang-suggestions#1459 · Filter by author Lanayx opened on Dec 25, 2025
  7

• Add for! (for-bang) keyword to computation expressions

  fsharp/fslang-suggestions#1458 · Filter by author Lanayx opened on Dec 23, 2025
  8

• mutable on any binding

  fsharp/fslang-suggestions#1457 · Filter by author Happypig375 opened on Dec 8, 2025
  4

• Nested field update syntax for records - field disambiguator

  fsharp/fslang-suggestions#1456 · Filter by author Happypig375 opened on Dec 4, 2025
  4

• Deprecate non-zero-based Array2Ds, fixing trimmability

  area: dotnet-codegenarea: library
  fsharp/fslang-suggestions#1454 · Filter by author charlesroddie opened on Nov 24, 2025
  7

• byref and inref for loops

  approved-in-principle
  fsharp/fslang-suggestions#1453 · Filter by author Happypig375 opened on Nov 21, 2025
  2

• Propose new method invocation syntax: obj.Method.[|args|] and obj.Method.{|namedArgs|}

  probably not
  fsharp/fslang-suggestions#1452 · Filter by author xp44mm opened on Nov 21, 2025
  3

• Support UnsafeAccessorAttribute

  fsharp/fslang-suggestions#1451 · Filter by author Lanayx opened on Nov 17, 2025
  7

• Allow defining covariant/contravariant type parameters for use in other .NET languages

  area: interoparea: object-programming
  fsharp/fslang-suggestions#1450 · Filter by author IS4Code opened on Nov 3, 2025
  4

• Algebraic Effects

  probably not
  fsharp/fslang-suggestions#1449 · Filter by author njlr opened on Oct 15, 2025
  7

• MatchFailure/MatchSkip patterns

  area: pattern-matching
  fsharp/fslang-suggestions#1448 · Filter by author IS4Code opened on Oct 9, 2025
  3

• Request for Delegate Generic Parameter Erasure for Span<T> Operations

  fsharp/fslang-suggestions#1447 · Filter by author RealmPlume opened on Sep 29, 2025

• Allow the use of colon in all custom operators

  area: syntax
  fsharp/fslang-suggestions#1446 · Filter by author roboz0r opened on Sep 28, 2025
  2

• Allow using byref<'T,'Kind> for type inference

  fsharp/fslang-suggestions#1445 · Filter by author IS4Code opened on Sep 22, 2025