Don't log stack trace for a bad package URL in a source file.

pkg/analyzer/test/generated/test_support.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 analyzer.test.generated.test_support;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 405 matching lines @@
 
   /**
    * Return `true` if the two errors are equivalent.
    *
    * @param firstError the first error being compared
    * @param secondError the second error being compared
    * @return `true` if the two errors are equivalent
    */
   bool _equalErrors(AnalysisError firstError, AnalysisError secondError) =>
       identical(firstError.errorCode, secondError.errorCode) &&
-      firstError.offset == secondError.offset &&
-      firstError.length == secondError.length &&
-      _equalSources(firstError.source, secondError.source);
+          firstError.offset == secondError.offset &&
+          firstError.length == secondError.length &&
+          _equalSources(firstError.source, secondError.source);
 
   /**
    * Return `true` if the two sources are equivalent.
    *
    * @param firstSource the first source being compared
    * @param secondSource the second source being compared
    * @return `true` if the two sources are equivalent
    */
   bool _equalSources(Source firstSource, Source secondSource) {
     if (firstSource == null) {
@@ skipping 91 matching lines @@
     return false;
   }
 }
 
 /**
  * Instances of the class [TestLogger] implement a logger that can be used by
  * tests.
  */
 class TestLogger implements Logger {
   /**
-   * The number of error messages that were logged.
+   * All logged messages.
    */
-  int errorCount = 0;
-
-  /**
-   * The number of informational messages that were logged.
-   */
-  int infoCount = 0;
+  List<String> log = [];
 
   @override
   void logError(String message, [CaughtException exception]) {
-    errorCount++;
+    log.add("error: $message");
   }
 
   @override
   void logInformation(String message, [CaughtException exception]) {
-    infoCount++;
+    log.add("info: $message");
   }
 }
 
 class TestSource extends Source {
   String _name;
   String _contents;
   int _modificationStamp = 0;
   bool exists2 = true;
 
   /**
@@ skipping 99 matching lines @@
     if (other is TestSource) {
       return other.uri == uri;
     }
     return false;
   }
 
   Uri resolveRelativeUri(Uri uri) {
     return this.uri.resolveUri(uri);
   }
 }