| Index: test/mjsunit/es6/regress/regress-2156.js
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| diff --git a/test/mjsunit/es6/regress/regress-2156.js b/test/mjsunit/es6/regress/regress-2156.js
 | 
| index fba2a298675d7aea15d23477c6b7c2827d9c4db0..a34e3816ba84da7b7ee27f079a9be9a5f13d781f 100644
 | 
| --- a/test/mjsunit/es6/regress/regress-2156.js
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| +++ b/test/mjsunit/es6/regress/regress-2156.js
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| @@ -25,7 +25,7 @@
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|  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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|  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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|  
 | 
| -// Flags: --allow-natives-syntax
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| +// Flags: --allow-natives-syntax --harmony-weak-collections
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|  
 | 
|  var key1 = {};
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|  var key2 = {};
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| 
 |