| Index: pkg/unittest/core_matchers.dart
 | 
| diff --git a/pkg/unittest/core_matchers.dart b/pkg/unittest/core_matchers.dart
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| index ad7fd899b014add9bd45bc1268e05f85d7de7682..e71e49176baa4e0a938b7c04fcabcd1f19e87705 100644
 | 
| --- a/pkg/unittest/core_matchers.dart
 | 
| +++ b/pkg/unittest/core_matchers.dart
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| @@ -12,7 +12,7 @@ class _Empty extends BaseMatcher {
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|    const _Empty();
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|    bool matches(item, MatchState matchState) {
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|      if (item is Map || item is Collection) {
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| -      return item.isEmpty();
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| +      return item.isEmpty;
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|      } else if (item is String) {
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|        return item.length == 0;
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|      } else {
 | 
| 
 |