| Index: sdk/lib/_internal/libraries.dart
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| diff --git a/sdk/lib/_internal/libraries.dart b/sdk/lib/_internal/libraries.dart
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| index 29961b060bd8ab5402ac55719b04bd83ee90a91c..709bf8a3acbc0fad059d06afffee95a491917eb6 100644
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| --- a/sdk/lib/_internal/libraries.dart
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| +++ b/sdk/lib/_internal/libraries.dart
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| @@ -22,9 +22,11 @@ const int VM_PLATFORM = 2;
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|   */
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|  const Map<String, LibraryInfo> LIBRARIES = const <LibraryInfo> {
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|  
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| -  "collection": const LibraryInfo(
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| -      "collection/collection.dart",
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| -      implementation: true),
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| +  "async": const LibraryInfo(
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| +      "async/async.dart",
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| +      dart2jsPatchPath: "_internal/compiler/implementation/lib/async_patch.dart"),
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| +
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| +  "collection": const LibraryInfo("collection/collection.dart"),
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|  
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|    "core": const LibraryInfo(
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|        "core/core.dart",
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| 
 |