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在 GitHub 查看Support "in" operation on objects that have been weakly updated
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#981 创建于 2017年9月19日
abstractenhancementhelp wanted
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描述
This code reports an error. It seems reasonable to make it work.
let b = __abstract("boolean", "NativeEnvironment.someBooleanProperty");
let ob1 = { };
let ob2 = { };
let ob3 = b ? ob1 : ob2;
ob3.bar = 777;
console.log("bar" in ob1);