/js/src/jit-test/tests/jaeger/bug625377.js

 1x = []
 2for(var i=0; i<3; i++) {
 3    var obj = { first: "first", second: "second" };
 4    var count = 0;
 5    for (var elem in obj) {
 6        delete obj.second;
 7        count++;
 8    }
 9    x.push(count);
10}
11assertEq(x[0], 1);
12assertEq(x[1], 1);
13assertEq(x[2], 1);