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