Yes, you'd have to wrap it in a match. But maybe you don't have to. If T1 is the normal case, then there's a type in Rust called Result that handles this kind

Yes, you'd have to wrap it in a match. But maybe you don't have to. If T1 is the normal case, then there's a type in Rust called Result that handles this kind of pattern. fn potentially_failing(thing: Result<Type1, Type2>) { thing.map(|foo| success_case(foo)); } this will only execute in the success case and ignore the error case map_err does the same, but only touching the error case