Narrows a Result.Base type to Result.Err<E> if it is an Err. If the Result is Result.Ok<S>, resolves to never.
Result.Base
Result.Err<E>
Err
Result
Result.Ok<S>
never
The Result.Base type to narrow.
Narrows a
Result.Basetype toResult.Err<E>if it is anErr. If theResultisResult.Ok<S>, resolves tonever.