anchor.diff:    Expect.isFalse(invocation.isAccessor);
     Expect.equals(#>>>, invocation.memberName);
     Expect.equals(1, invocation.positionalArguments.length);
  -  Expect.identical(c2, invocation.positionalArguments[1]);
  +  Expect.identical(c2, invocation.positionalArguments[0]);
     Expect.equals(0, invocation.namedArguments.length);
   
     // And unimplemented interface methods.
  
positive.code:   Expect.isFalse(invocation.isAccessor);
    Expect.equals(#>>>, invocation.memberName);
    Expect.equals(1, invocation.positionalArguments.length);
    Expect.identical(c2, invocation.positionalArguments[1]);
    Expect.equals(0, invocation.namedArguments.length);
  
    invocation = (nsm >>>= c2);
  
negative.code:   Expect.isFalse(invocation.isAccessor);
    Expect.equals(#>>>, invocation.memberName);
    Expect.equals(1, invocation.positionalArguments.length);
    Expect.identical(c2, invocation.positionalArguments[0]);
    Expect.equals(0, invocation.namedArguments.length);
  
    // If there is an interface, we must match it, even if the call
  