Catch exceptions while preparing analysis.implemented notification.

pkg/analysis_server/lib/src/operation/operation_analysis.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.
 
 library operation.analysis;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/computer/computer_highlights.dart';
 import 'package:analysis_server/src/computer/computer_highlights2.dart';
 import 'package:analysis_server/src/computer/computer_outline.dart';
@@ skipping 30 matching lines @@
 
 scheduleImplementedNotification(
     AnalysisServer server, Iterable<String> files) async {
   SearchEngine searchEngine = server.searchEngine;
   if (searchEngine == null) {
     return;
   }
   for (String file in files) {
     CompilationUnitElement unitElement = server.getCompilationUnitElement(file);
     if (unitElement != null) {
-      ImplementedComputer computer =
-          new ImplementedComputer(searchEngine, unitElement);
-      await computer.compute();
-      var params = new protocol.AnalysisImplementedParams(
-          file, computer.classes, computer.members);
-      server.sendNotification(params.toNotification());
+      try {
+        ImplementedComputer computer =
+            new ImplementedComputer(searchEngine, unitElement);
+        await computer.compute();
+        var params = new protocol.AnalysisImplementedParams(
+            file, computer.classes, computer.members);
+        server.sendNotification(params.toNotification());
+      } catch (exception, stackTrace) {
+        server.sendServerErrorNotification(
+            'Failed to send analysis.implemented notification.',
+            exception,
+            stackTrace);
+      }
     }
   }
 }
 
 /**
  * Schedules indexing of the given [file] using the resolved [dartUnit].
  */
 void scheduleIndexOperation(
     AnalysisServer server, String file, CompilationUnit dartUnit) {
   if (server.index != null) {
@@ skipping 462 matching lines @@
 abstract class _SingleFileOperation extends SourceSensitiveOperation {
   final String file;
 
   _SingleFileOperation(AnalysisContext context, this.file) : super(context);
 
   @override
   bool shouldBeDiscardedOnSourceChange(Source source) {
     return source.fullName == file;
   }
 }