[Feature request] Add ability to match multiple classes in Generics

[eximius313]

Java allows for & in Generics.
With it, one can do something like this:

abstract interface class MyInterface1 {
  String doSomething();
}
abstract interface class MyInterface2 {
  String doOther();
}

class MyService<T extends MyInterface1 & MyInterface2> {
  void operateOn(T t) {
      //can call "doSomething" from "MyInterface1" and "doOther" from "MyInterface2"
  }
}

Could you please allow such a syntax?

---

In your issue, please include:

• Dart version and tooling diagnostic info (dart info) -> - Dart 3.0.0 (stable) (Thu May 4 01:11:00 2023 -0700) on "windows_x64"
• Whether you are using Windows, macOS, or Linux (if applicable) -> Windows 10
• Whether you are using Chrome, Safari, Firefox, Edge (if applicable) -> N/A

[lrhn]

This would be a language feature, so it belongs in the language repository.

There is already (at least) one request for multiple bounds on the same type parameter, dart-lang/language#2709, so I'll close this issue as a duplicate of that, and further discussion should continue there.

[eximius313]

Thank you