Published on: 2025-05-23 10:15:12
Rust Any Part 3: Finally we have Upcasts Three years ago I shared the As-Any Hack on this blog. That hack is a way to get upcasting to supertraits working on stable Rust. To refresh your memory, the goal was to make something like this work: #[derive(Debug)] struct AnyBox ( Box < dyn DebugAny > ); trait DebugAny : Any + Debug {} impl < T : Any + Debug + ' static > DebugAny for T {} The problem? Even though DebugAny inherits from Any , Rust wouldn't let you use methods from Any on a dyn DebugA
Keywords: any_box debugany downcast_ref dyn i32
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