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• 00:08, 21 November 2025 PC talk contribs created page Upcasting Trait Objects in Rust 1.86: Why You Didn’t Know You Needed It (Created page with "500px The “Wait, Why Doesn’t This Work?” Moment Every Rust developer hits this wall at some point. You’ve got a bunch of trait objects (Box<dyn Trait>, maybe nested ones), and you think,
“If trait Child extends Parent, surely I can treat a Box<dyn Child> as a Box<dyn Parent>.” Then Rust laughs in your face.
No — you can’t just upcast a trait object. For years, this was one of those things we all hand-waved...")