anchor.diff:  import 'package:analyzer/dart/element/type.dart';
   import 'package:analyzer/dart/element/type_provider.dart';
   import 'package:analyzer/dart/element/type_system.dart';
  -import 'package:analyzer/src/dart/element/type.dart';
   import 'package:analyzer/src/dart/resolver/body_inference_context.dart';
   
   /// Convert a relevance score (assumed to be between `0.0` and `1.0` inclusive)
  
positive.code:       if (functionBody != null) {
          return BodyInferenceContext.of(functionBody).contextType;
        }
  //      return _returnType(node);
      }
      return null;
    }
  
negative.code:       if (functionBody != null) {
          return BodyInferenceContext.of(functionBody).contextType;
        }
      }
      return null;
    }
  