| Index: sdk/lib/core/set.dart
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| diff --git a/sdk/lib/core/set.dart b/sdk/lib/core/set.dart
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| index a908d5748ab4871b191ca19990a4f7d7f25b1d08..2c6b52417de05453bbd6670f27eef09cf4fca7dd 100644
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| --- a/sdk/lib/core/set.dart
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| +++ b/sdk/lib/core/set.dart
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| @@ -31,7 +31,7 @@ part of dart.core;
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|   * iterating either the set itself or any [Iterable] that is backed by the set,
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|   * such as the ones returned by methods like [where] and [map].
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|   */
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| -abstract class Set<E> implements EfficientLengthIterable<E> {
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| +abstract class Set<E> extends Iterable<E> implements EfficientLength {
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|    /**
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|     * Creates an empty [Set].
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|     *
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| 
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