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class C {
constructor(a,b) { this.b = b; }
}
class C2 {
constructor(a,b) { this.b = b; }
}
var flip = false;
function foo() {
let c = flip ? C : C2;
flip = !flip;
return new c(...arguments);
}
for (var i = 0; i < 2000; i++) {
assertEq(foo().b, undefined);
}