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immutable-butterfly-to-string-cache-should-not-happen-for-generic-join.js
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let x
=
{
__proto__
:
Object
,
};
function
foo
()
{
Object
.
defineProperty
(
Object
,
0
,
{});
}
let o
=
{
toString
:
foo
};
delete
{}[[...[
o
]]];