library test;

import 'dart:async';

abstract class MyStream<T> extends Stream<T> {
  factory MyStream() => throw '';
}

class Bar<T extends Stream<String>> {
  foo(T t) async {}
}

class Baz<T, E extends Stream<T>, S extends E> {
  foo(S t) async {}
}

class Foo {
  int bar = 42;
}

main() {}
test() async {}