The latest model of Microsoft’s multi-paradigm language incorporates a much-sought capability to suppress warnings in specified code sections.
With the scoped warning suppression functionality, the compiler now helps the #warnon directive, which is paired with #nowarn to disable or allow warnings inside a particular code span. The F# 10 replace was launched together with .NET 10 on November 11. Builders can get F# 10 by downloading .NET 10 or by accessing Visible Studio 2026 Insiders. A November 17 weblog submit introducing F# 10 notes that some modifications to enhance the consistency of #nowarn/#warnon directives have been breaking modifications, which might have an effect on a codebase when updating to the brand new model.
F# 10 additionally permits builders to use distinct entry modifiers to particular person property accessors. This functionality permits builders to specify entry ranges for the getter and setter of a property inline, enabling widespread patterns similar to publicly readable however privately mutable state with out verbose boilerplate. One other new functionality in F# 10 permits optionally available parameters to make use of a struct-based ValueOption<'T> illustration. By making use of the [<Struct>] attribute to an optionally available parameter, builders can instruct the compiler to make use of ValueOption<'T> as a substitute of the reference-based choice sort. This avoids a heap allocation for the choice wrapper, which is helpful in performance-critical code. Different enhancements obtainable in F# 10 embody the next: