anchor.diff:  // Copyright (c) 2014, 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.
  -
  -import 'dart:collection';
   
   import 'package:analyzer/dart/analysis/features.dart';
   import 'package:analyzer/dart/ast/ast.dart';
  
positive.code:       }
        if (iterable != null) {
          LocalVariableElementImpl element = loopVariable.declaredElement;
          DartType exprType = iterable.staticType;
          DartType targetType = (awaitKeyword == null)
              ? _typeProvider.iterableType
              : _typeProvider.streamType;
          DartType iteratedType = _findIteratedType(exprType, targetType);
          if (element != null && iteratedType != null) {
            element.type = iteratedType;
            loopVariable.identifier.staticType = iteratedType;
          }
        }
      }
  
negative.code:       return _dynamicType;
      }
      return returnType.type;
    }
  
    /**
  