| Index: pkg/unittest/lib/src/core_matchers.dart
 | 
| diff --git a/pkg/unittest/lib/src/core_matchers.dart b/pkg/unittest/lib/src/core_matchers.dart
 | 
| index b9bde13434452e5779b343d8fedf1f2621815255..e120c9e80acfe2d5b6637d470837b4d9b91ad750 100644
 | 
| --- a/pkg/unittest/lib/src/core_matchers.dart
 | 
| +++ b/pkg/unittest/lib/src/core_matchers.dart
 | 
| @@ -418,11 +418,10 @@ class Throws extends Matcher {
 | 
|        // completes.
 | 
|        item.then((value) {
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|          done(() => fail("Expected future to fail, but succeeded with '$value'."));
 | 
| -      }, onError: (error) {
 | 
| +      }, onError: (error, trace) {
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|          done(() {
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|            if (_matcher == null) return;
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|            var reason;
 | 
| -          var trace = getAttachedStackTrace(error);
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|            if (trace != null) {
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|              var stackTrace = trace.toString();
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|              stackTrace = "  ${stackTrace.replaceAll("\n", "\n  ")}";
 | 
| 
 |