"The newest version of Microsoft's multi-paradigm language features a much-sought ability to suppress warnings in specified code sections. With the scoped warning suppression capability, the compiler now supports the #warnon directive, which is paired with #nowarn to disable or enable warnings within a specific code span. The F# 10 update was introduced along with .NET 10 on November 11. Developers can get F# 10 by downloading .NET 10 or by accessing Visual Studio 2026 Insiders."
"F# 10 also allows developers to apply distinct access modifiers to individual property accessors. This capability allows developers to specify access levels for the getter and setter of a property inline, enabling common patterns such as publicly readable but privately mutable state without verbose boilerplate. Another new capability in F# 10 enables optional parameters to use a struct-based ValueOption<'T> representation. By applying the [<Struct>] attribute to an optional parameter, developers can instruct the compiler to use ValueOption<'T> instead of the reference-based option type."
F# 10 introduces scoped warning suppression using paired #warnon and #nowarn directives to disable or enable warnings within specific code spans. The compiler supports the #warnon directive alongside #nowarn, improving control over warning behavior, though related consistency changes may be breaking for some codebases. F# 10 allows distinct access modifiers on individual property accessors, enabling inline getter/setter access level specification and common patterns like public read, private write without boilerplate. Optional parameters can use a struct-based ValueOption by applying the [<Struct>] attribute, avoiding a heap allocation for the option wrapper in performance-sensitive scenarios. F# 10 released with .NET 10 on November 11 and is available via .NET 10 or Visual Studio 2026 Insiders. Other improvements include additional language and compiler enhancements.
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