Extracts the error value type E from a Result.Err<E>. If the Result is Result.Ok<S>, resolves to never.
E
Result.Err<E>
Result
Result.Ok<S>
never
The UnknownResult type to unwrap.
UnknownResult
Extracts the error value type
Efrom aResult.Err<E>. If theResultisResult.Ok<S>, resolves tonever.