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What's New in F# 9


Find information on the new features available in F# 9.

The compiler now correctly enforces the AttributeTargets on let values, functions, union case declarations, implicit constructors, structs, and classes. There have been continuous improvements in parser recovery, meaning that tooling (for example, syntax highlighting) still works with code when you're in the middle of editing it and it might not be syntactically correct at all times. Previously, signature help wasn't offered in a situation like the following, where a function in the middle of a pipeline already had a complex curried parameter (for example, a lambda) applied to it.

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