fix: don't conform errors for swift 6 support

[cjbell]

• Creates an error wrapper instead of conforming FlutterError as Error (which fails in Swift 6)

KNO-6949

[linear]

KNO-6949 [Flutter SDK] Investigate OS update issues

[brentjanderson]

LGTM - I think the introduction of hte wrapper is, itself, an interesting requirement here, but without further context this seems syntactically correct.

Have we validated this against versions less than Swift 6? Seems like it's just a plain struct that we're introducing here, so it's pretty clean.

[cjbell]

@brentjanderson

Yep the reason we're doing this is:

The error "extension declares a conformance of imported type" occurs when you're trying to extend an imported type (like FlutterError from the Flutter framework) to conform to a protocol (like Error). In Swift, you are not allowed to declare a conformance of an imported type in an extension if you don’t own the type (i.e., you didn't define the type in your own module).
In your case, FlutterError is a type imported from the Flutter framework, and you're trying to extend it to conform to the Error protocol. Swift does not allow you to add conformance to types that you don't own unless it's done in the original module that defines the type.

A plain struct wrapper is absolutely compatible

[cjbell]

ChatGPT thread: https://chatgpt.com/share/66ec389b-8ff0-8011-a57b-9e96d5e2dc7b