Introduce benign errors.

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;
 
@@ skipping 1232 matching lines @@
   }
 
   void reportDiagnostic(DiagnosticMessage message,
                         List<DiagnosticMessage> infos,
                         api.Diagnostic kind);
 
   void reportCrashInUserCode(String 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) {
+    if (testMode) {
+      // When in test mode, i.e. on the build-bot, we always stop compilation.
+      return true;
+    }
+    if (reporter.options.fatalWarnings) {
+      return true;
+    }
+    return !BENIGN_ERRORS.contains(message.message.kind);
+  }
+
+  void fatalDiagnosticReported(DiagnosticMessage message,
+                               List<DiagnosticMessage> infos,
+                               api.Diagnostic kind) {
+    if (markCompilationAsFailed(message, kind)) {
+      compilationFailed = true;
+    }
+  }
+
   /**
    * Translates the [resolvedUri] into a readable URI.
    *
    * The [importingLibrary] holds the library importing [resolvedUri] or
    * [:null:] if [resolvedUri] is loaded as the main library. The
    * [importingLibrary] is used to grant access to internal libraries from
    * platform libraries and patch libraries.
    *
    * If the [resolvedUri] is not accessible from [importingLibrary], this method
    * is responsible for reporting errors.
@@ skipping 431 matching lines @@
         break;
       }
     }
     lastDiagnosticWasFiltered = false;
     reportDiagnostic(message, infos, kind);
   }
 
   void reportDiagnostic(DiagnosticMessage message,
                         List<DiagnosticMessage> infos,
                         api.Diagnostic kind) {
+    compiler.reportDiagnostic(message, infos, kind);
     if (kind == api.Diagnostic.ERROR ||
         kind == api.Diagnostic.CRASH ||
         (options.fatalWarnings &&
          kind == api.Diagnostic.WARNING)) {
-      compiler.compilationFailed = true;
+      compiler.fatalDiagnosticReported(message, infos, kind);
     }
-    compiler.reportDiagnostic(message, infos, kind);
   }
 
   /**
    * Perform an operation, [f], returning the return value from [f].  If an
    * error occurs then report it as having occurred during compilation of
    * [element].  Can be nested.
    */
   withCurrentElement(Element element, f()) {
     Element old = currentElement;
     _currentElement = element;
@@ skipping 377 matching lines @@
     if (_otherDependencies == null) {
       _otherDependencies = new Setlet<Element>();
     }
     _otherDependencies.add(element.implementation);
   }
 
   Iterable<Element> get otherDependencies {
     return _otherDependencies != null ? _otherDependencies : const <Element>[];
   }
 }