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C# 15 union types announcement graphic from the Microsoft .NET Blog
Open Source·

C# is getting union types in version 15. The preview shipped in .NET 11 Preview 2.

Mads Torgersen's union proposal landed in .NET 11 Preview 2 on April 2. C# 15 targets November 2026 and replaces the OneOf library hack the .NET community has been living with.

Rust programming language logo on an orange gradient background
Open Source·

Rust 1.95 lands with if-let guards and a macro that kills cfg-if

Rust 1.95.0 stabilized cfg_select!, if-let guards in match arms, and a pile of new Vec and atomic APIs. Here's what's actually worth upgrading for.