test/mjsunit/regress/regress-1849.js

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// See: http://code.google.com/p/v8/issues/detail?id=1849

// Flags: --allow-natives-syntax

var count = 1e5;
var arr = new Array(count);
assertFalse(%HasFastDoubleElements(arr));
for (var i = 0; i < count; i++) {
  arr[i] = 0;
}
assertFalse(%HasFastDoubleElements(arr));
assertTrue(%HasFastSmiElements(arr));