| Index: test/mjsunit/es6/regress/regress-2829.js
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| diff --git a/test/mjsunit/es6/regress/regress-2829.js b/test/mjsunit/es6/regress/regress-2829.js
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| index b48039cf0bc5093af079b19273550d5b0c012659..8d8f3f8c395117b3da98240e28ef9e931cb255e2 100644
 | 
| --- a/test/mjsunit/es6/regress/regress-2829.js
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| +++ b/test/mjsunit/es6/regress/regress-2829.js
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| @@ -25,6 +25,8 @@
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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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|  
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| +// Flags: --harmony-weak-collections
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| +
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|  (function test1() {
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|    var wm1 = new WeakMap();
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|    wm1.set(Object.prototype, 23);
 | 
| 
 |