Report info messages together with their error, warning, or hint.

pkg/compiler/lib/src/dart_backend/outputter.dart

 // 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.
 
 part of dart_backend;
 
 typedef bool IsSafeToRemoveTypeDeclarations(
     Map<ClassElement, Iterable<Element>> classMembers);
 typedef void ElementCallback<E>(E element);
 typedef void ElementPostProcessFunction(
@@ skipping 281 matching lines @@
           fixedDynamicNames.add(parameter.name);
         }
       }
       ClassElement cls = element.enclosingClass;
       if (cls != null && cls.isEnumClass) {
         fixedDynamicNames.add('index');
 
         ClassElement existingEnumClass =
             enumClassMap.putIfAbsent(cls.name, () => cls);
         if (existingEnumClass != cls) {
-          listener.reportError(cls, MessageKind.GENERIC,
-              {'text': "Duplicate enum names are not supported in dart2dart."});
-          listener.reportInfo(existingEnumClass, MessageKind.GENERIC,
-              {'text': "This is the other declaration of '${cls.name}'."});
+          listener.reportError(
+              listener.createMessage(
+                  cls,
+                  MessageKind.GENERIC,
+                  {'text': "Duplicate enum names are not supported "
+                           "in dart2dart."}),
+          <DiagnosticMessage>[
+              listener.createMessage(
+                  existingEnumClass,
+                  MessageKind.GENERIC,
+                  {'text': "This is the other declaration of '${cls.name}'."}),
+          ]);
         }
       }
     }
 
     fixedStaticNames.addAll(enumClassMap.keys);
 
     // The VM will automatically invoke the call method of objects
     // that are invoked as functions. Make sure to not rename that.
     fixedDynamicNames.add('call');
 
@@ skipping 272 matching lines @@
       outputProvider("", "dart")
            ..add(code)
            ..close();
 
       totalSize = code.length;
     }
 
     return totalSize;
   }
 }