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Nov 12, 2025
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link to the new F# spec website #1014

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link to the new F# spec website
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35 changes: 24 additions & 11 deletions specs/language-spec/index.md
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Expand Up @@ -10,37 +10,49 @@ technical explanation of the F# language constructs and required compiler behavi
It discusses topics such as lexical analysis, grammar, types including type inference
algorithm, expressions, patterns and other.

The spec currently consists of a [spec document](https://fsharp.github.io/fslang-spec/)
and a collection of RFCs. Earlier versions are listed below.

### F# 2.0

* [The F# 2.0 Language Specification (final version, PDF)](2.0/FSharpSpec-2.0-April-2012.pdf) - The final version of the F# 2.0 language
specification.
* [The F# 2.0 Language Specification (final version, PDF)](2.0/FSharpSpec-2.0-April-2012.pdf) -
The final version of the F# 2.0 language specification.

### F# 3.0

* [The F# 3.0 Language Specification (final version, PDF)](3.0/FSharpSpec-3.0-final.pdf) - The final version of the F# 3.0 language
specification.
* [The F# 3.0 Language Specification (final version, PDF)](3.0/FSharpSpec-3.0-final.pdf) -
The final version of the F# 3.0 language specification.

### F# 3.1

* [The F# 3.1 Language Specification (final version, PDF)](3.1/FSharpSpec-3.1-final.pdf) - The final version of the F# 3.1 language specification.
* [The F# 3.1 Language Specification (final version, PDF)](3.1/FSharpSpec-3.1-final.pdf) -
The final version of the F# 3.1 language specification.

### F# 4.0

* [The F# 4.0 Language Specification (near-final version, PDF)](4.0/FSharpSpec-4.0-final.pdf) - The near-final version of the F# 4.0 language specification.
* [The F# 4.0 Language Specification (near-final version, PDF)](4.0/FSharpSpec-4.0-final.pdf) -
The near-final version of the F# 4.0 language specification.

* The [RFCs for F# 4.0](https://github.com/fsharp/fslang-design/tree/master/FSharp-4.0) provide primary documentation for the new features added.
* The [RFCs for F# 4.0](https://github.com/fsharp/fslang-design/tree/master/FSharp-4.0)
provide primary documentation for the new features added.

### F# 4.1

* [The F# 4.1 Language Specification (latest, PDF)](4.1/FSharpSpec-4.1-latest.pdf), [(latest, DOCX)](4.1/FSharpSpec-4.1-latest.docx) - The latest, working version of the F# 4.1 language specification.
* [The F# 4.1 Language Specification (latest, PDF)](4.1/FSharpSpec-4.1-latest.pdf),
[(latest, DOCX)](4.1/FSharpSpec-4.1-latest.docx) -
The latest, working version of the F# 4.1 language specification.

### F# 4.1-9.0

Since F# 4.1 new features have been documented through [RFCs](https://github.com/fsharp/fslang-design) and additions to [the F# Language Guide](https://docs.microsoft.com/en-us/dotnet/fsharp/).
Since F# 4.1 new features have been documented through
[RFCs](https://github.com/fsharp/fslang-design) and additions to
[the F# Language Guide](https://docs.microsoft.com/en-us/dotnet/fsharp/).

**Note:** We changed the versioning scheme after F# 5.0, and F# 6.0 became F# 6.

* [The F# Language Specification (latest, PDF)](4.1/FSharpSpec-4.1-latest.pdf), [(latest, DOCX)](4.1/FSharpSpec-4.1-latest.docx) - The latest, working version of the F# language specification.
* [The F# Language Specification (latest, PDF)](4.1/FSharpSpec-4.1-latest.pdf),
[(latest, DOCX)](4.1/FSharpSpec-4.1-latest.docx) -
The latest, working version of the F# language specification.

* The [RFCs for F# 4.0](https://github.com/fsharp/fslang-design/tree/master/FSharp-4.0)

Expand All @@ -66,4 +78,5 @@ Since F# 4.1 new features have been documented through [RFCs](https://github.com

* The [preview RFCs beyond F# 9](https://github.com/fsharp/fslang-design/tree/master/preview)

**Note:** We're currently working on an improved version of the F# language specification [here](https://github.com/fsharp/fslang-spec/). Contributions welcome!
**Note:** We're currently working on an improved version of the F# language specification
[here](https://github.com/fsharp/fslang-spec/). Contributions welcome!