Failing gracefully

pkg/docgen/lib/docgen.dart

 // Copyright (c) 2013, 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.
 
 /**
  * **docgen** is a tool for creating machine readable representations of Dart 
  * code metadata, including: classes, members, comments and annotations.
  * 
  * docgen is run on a `.dart` file or a directory containing `.dart` files. 
  * 
@@ skipping 164 matching lines @@
   Uri packageUri = null;
   if (packageRoot != null) {
     packageUri = currentDirectory.resolve(appendSlash('$packageRoot'));
   }
   List<Uri> librariesUri = <Uri>[];
   libraries.forEach((library) {
     librariesUri.add(currentDirectory.resolve(library));
   });
   return dart2js.analyze(librariesUri, libraryUri, packageUri,
       provider.readStringFromUri, diagnosticHandler,
-      ['--preserve-comments', '--categories=Client,Server']);
+      ['--preserve-comments', '--categories=Client,Server'])
+      ..catchError((error) {
+        logger.severe('Error: Failed to create mirror system. ');
+        // To avoid printing the stack trace. 
+        exit(1);

[Andrei Mouravski, 2013/06/28 22:57:34]

I think you can actually extract the stack trace in the new system, though I'm
not sure... Ask Nathan or Bob.

[janicejl, 2013/06/28 23:47:12]

Have talked to Nathan. 

Dart2js analyze throws a string when it fails to create a mirror system, and
hence it is not possible to use the stack trace package to extract fine details
about the error. 

+      });
 }
 
 /**
  * Creates documentation for filtered libraries.
  */
 void _documentLibraries(List<LibraryMirror> libraries) {
   libraries.forEach((lib) {
     // Files belonging to the SDK have a uri that begins with 'dart:'.
     if (includeSdk || !lib.uri.toString().startsWith('dart:')) {
       var library = generateLibrary(lib);
@@ skipping 350 matching lines @@
     parameterMap['qualifiedname'] = qualifiedName;
     parameterMap['optional'] = isOptional.toString();
     parameterMap['named'] = isNamed.toString();
     parameterMap['default'] = hasDefaultValue.toString();
     parameterMap['type'] = type;
     parameterMap['value'] = defaultValue;
     parameterMap['annotations'] = new List.from(annotations);
     return parameterMap;
   } 
 }