close_sinks

class A {
  IOSink _sinkA;
  void init(filename) {
    _sinkA = File(filename).openWrite(); // LINT
  }
}

void someFunction() {
  IOSink _sinkF; // LINT
}

class B {
  IOSink _sinkB;
  void init(filename) {
    _sinkB = File(filename).openWrite(); // OK
  }

  void dispose(filename) {
    _sinkB.close();
  }
}

void someFunctionOK() {
  IOSink _sinkFOK; // OK
  _sinkFOK.close();
}