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* New diagnostics from the compiler
* Switches for compiler parallelization
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! 9.0<ref>{{Cite web|url=https://learn.microsoft.com/en-us/dotnet/fsharp/whats-new/fsharp-9|title=What's new in F# 9| date=12 November 2024}}</ref>
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* Nullable reference types
* Discriminated union .Is* properties
* Partial active patterns can return bool instead of unit option
* Prefer extension methods to intrinsic properties when arguments are provided
* Empty-bodied computation expressions
* Hash directives are allowed to take non-string arguments
* Extended #help directive in fsi to show documentation in the REPL
* Allow #nowarn to support the FS prefix on error codes to disable warnings
* Warning about TailCall attribute on non-recursive functions or let-bound values
* Enforce attribute targets
* Updates to the standard library (FSharp.Core)
* Developer productivity improvements
* Performance improvements
* Improvements in tooling
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