Reinsert (and test) handling of exceptions from user code.

pkg/compiler/lib/src/compiler.dart

 // Copyright (c) 2012, 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 dart2js.compiler_base;
 
 import 'dart:async' show EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'cache_strategy.dart' show CacheStrategy;
@@ skipping 1039 matching lines @@
           .log('Compiled ${enqueuer.codegen.generatedCode.length} methods.');
       progress.reset();
     }
     return backend.codegen(work);
   }
 
   void reportDiagnostic(DiagnosticMessage message,
       List<DiagnosticMessage> infos, api.Diagnostic kind);
 
   void reportCrashInUserCode(String message, exception, stackTrace) {
-    _reporter.onCrashInUserCode(message, exception, stackTrace);
+    reporter.onCrashInUserCode(message, exception, stackTrace);
   }
 
   /// Messages for which compile-time errors are reported but compilation
   /// continues regardless.
   static const List<MessageKind> BENIGN_ERRORS = const <MessageKind>[
     MessageKind.INVALID_METADATA,
     MessageKind.INVALID_METADATA_GENERIC,
   ];
 
   bool markCompilationAsFailed(DiagnosticMessage message, api.Diagnostic kind) {
@@ skipping 693 matching lines @@
               api.Diagnostic.CRASH);
         }
         pleaseReportCrash();
       }
     } catch (doubleFault) {
       // Ignoring exceptions in exception handling.
     }
     throw error;
   }
 
+  @override
   void onCrashInUserCode(String message, exception, stackTrace) {
     hasCrashed = true;
     print('$message: ${tryToString(exception)}');
     print(tryToString(stackTrace));
   }
 
   void reportSuppressedMessagesSummary() {
     if (!options.showAllPackageWarnings && !options.suppressWarnings) {
       suppressedWarnings.forEach((Uri uri, SuppressionInfo info) {
         MessageKind kind = MessageKind.HIDDEN_WARNINGS_HINTS;
@@ skipping 231 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }