library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/nnbd_mixed/sink_hierarchy.dart:5:1: Error: A library can't opt out of non-nullable by default, when in nnbd-strong mode.
// // @dart=2.6
// ^^^^^^^^^^^^
//
import self as self;
import "dart:core" as core;
import "dart:async" as asy;

abstract class Sink<T extends core::Object? = dynamic> extends core::Object {
  synthetic constructor •() → self::Sink<self::Sink::T%>
    ;
  abstract method close() → void;
}
abstract class EventSink<T extends core::Object? = dynamic> extends core::Object implements self::Sink<self::EventSink::T%> {
  synthetic constructor •() → self::EventSink<self::EventSink::T%>
    ;
  abstract method close() → void;
}
abstract class StreamConsumer<S extends core::Object? = dynamic> extends core::Object {
  synthetic constructor •() → self::StreamConsumer<self::StreamConsumer::S%>
    ;
  abstract method close() → asy::Future<dynamic>;
}
abstract class StreamSink<S extends core::Object? = dynamic> extends core::Object implements self::EventSink<self::StreamSink::S%>, self::StreamConsumer<self::StreamSink::S%> {
  synthetic constructor •() → self::StreamSink<self::StreamSink::S%>
    ;
  abstract method close() → asy::Future<dynamic>;
}
static method main() → dynamic
  ;