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I think what you're looking for is std::any; https://doc.rust-lang.org/std/any/index.html https://doc.rust-lang.org/std/any/index.html The example there includ

I think what you're looking for is std::any; https://doc.rust-lang.org/std/any/index.html https://doc.rust-lang.org/std/any/index.html The example there includes a function that takes Any + Debug, tries to downcast to a String, and if that succeeds it logs the string length

ramon156 2y ago
Did not know this existed!
zevv 2y ago
Right, it seems `Any` and `downcast_ref::<>` were the missing parts for the downcasting. Upcasting is new in nightly with `#![feature(trait_upcasting)]`