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Why Async Traits in Rust Break Object Safety and How to Work Around It

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Rust developers encounter a compiler error when trying to use traits with async methods as trait objects, such as storing them in a Vec<Box<dyn Trait>>. The root cause is structural: async functions desugar into anonymous state machines whose sizes vary per implementor, making them incompatible with the fixed-size vtable entries required for dynamic dispatch. This is not a temporary bug but a fundamental design constraint the Rust compiler team has confirmed will not be resolved soon. Three established workarounds exist, each suited to different scenarios depending on whether implementors form a closed set, an open set from third-party code, or a library context where boxing overhead is a concern. Developers can choose the appropriate approach by weighing working code examples and a cost comparison across all three strategies.

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