Possible to throw different errors depending on where route matching failed?

[tfe]

I'm looking at refactoring an existing iOS app's deep link URL handling to use this, loving the type safety and bi-directionality for link generation.

Right now, I have two different error cases to distinguish unrecoverable (things we've messed up, like a config problem) and recoverable (might be solved by an app update, i.e. a newly introduced endpoint) errors. That way I can provide a more useful error message and recovery suggestion to the user.

Is it possible to accomplish this within swift-url-routing and/or swift-parsing?

In more concrete terms, my router looks something like this; see the inline comments for the desired behavior.

OneOf {
    /// Universal Links
    Route(.case(RootRoute.universalLink)) {
        OneOf {
            Scheme("http")
            Scheme("https")
        }
        Host("www.example.com")
        // IDEALLY: throw unrecoverable error if scheme/host doesn't match
        appRouter
        // All other routing errors are considered recoverable, and I could just do a non-specific catch and re-throw my own error type
    }

    /// Legacy deep links
    Route(.case(RootRoute.legacyDeepLink)) {
        Scheme("myapp")
        // IDEALLY: throw unrecoverable error if scheme doesn't match
        Host("preview")
        // IDEALLY: throw unrecoverable error if host doesn't match
        onDevicePreviewRouter
        // All other routing errors are considered recoverable, and I could just do a non-specific catch and re-throw my own error type
    }
}