Fix analyzer warning / bug: Iterable was treated as if it has sublist()

test/pb_list_test.dart

 #!/usr/bin/env dart
 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library pb_list_tests;
 
 import 'package:protobuf/protobuf.dart';
 import 'package:unittest/unittest.dart';
 
@@ skipping 43 matching lines @@
 
     lb2.addAll([1, 2, 3, 4, 5, 6, 7, 8, 9]);
     expect(lb2.sublist(3, 7), [4, 5, 6, 7]);
 
     lb2.setRange(3, 7, [9, 8, 7, 6]);
     expect(lb2, [1, 2, 3, 9, 8, 7, 6, 8, 9]);
 
     lb2.removeRange(5, 8);
     expect(lb2, [1, 2, 3, 9, 8, 9]);
 
+    expect(() => lb2.setRange(5, 7, [88, 99].take(2)), throwsRangeError);
+    expect(lb2, [1, 2, 3, 9, 8, 9]);
+
+    expect(() => lb2.setRange(5, 7, [88, 99].take(2), 1), throwsRangeError);
+    expect(lb2, [1, 2, 3, 9, 8, 9]);
+
+    expect(() => lb2.setRange(4, 6, [88, 99].take(1), 1), throwsStateError);
+    expect(lb2, [1, 2, 3, 9, 8, 9]);
+
+    lb2.setRange(5, 6, [88, 99].take(2));
+    expect(lb2, [1, 2, 3, 9, 8, 88]);
+
+    lb2.setRange(5, 6, [88, 99].take(2), 1);
+    expect(lb2, [1, 2, 3, 9, 8, 99]);
+
     expect(() { (new PbList<int>() as dynamic).add('hello'); }, throws);
 
     PbSint32List listSint32 = new PbSint32List();
 
     expect(() { listSint32.add(-2147483649); }, throwsArgumentError);
 
     expect(() { listSint32.add(-2147483648); },
         returnsNormally,
         reason: 'could not add min_sint32 to PbSint32List');
 
@@ skipping 25 matching lines @@
 
     expect(() { listFloat.add(3.4028234663852886E38); },
         returnsNormally,
         reason: 'could not add max_float to PbUint64List');
 
     expect(() { listFloat.add(-3.4028234663852886E38); },
         returnsNormally,
         reason: 'could not add max_float to PbUint64List');
   });
 }