anchor.diff:    final $dart$core.Function _function;
     final $dart$core.int _variadicIndex;
   
  +  $dart$core.bool operator ==($dart$core.Object other) => false;
  +
     dart$Callable([$dart$core.Function this._function, $dart$core.int this._variadicIndex = -1]);
   
     // for non-spread calls `f()`
  
positive.code: 
    dart$FlatFunction(Callable this.tupleFunction);
  
    // for non-spread calls `f()`, always use noSuchMethod.
  
    // for spread calls `s()`, always use noSuchMethod.
  
negative.code: 
    dart$UnflatFunction(Callable this.flatFunction);
  
    $dart$core.bool operator ==($dart$core.Object other) => false;
  
    // for non-spread calls `f()`, always use noSuchMethod.
  
    // for spread calls `s()`, always use noSuchMethod.
  