8023368: Instance __proto__ property should exist and be writable.
Reviewed-by: attila, hannesw
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/**
* Check that the expression ("property" in obj) works for own property as
* well as properties 'inherited' from proto chain.
*
* @test
* @run
*/
function MyCons() {
this.foo = "hello";
}
MyCons.prototype.func = function() { print("func " + this); }
MyCons.prototype.num = 1729;
var myObj = new MyCons();
print("foo? " + ("foo" in myObj));
print("func? " + ("func" in myObj));
print("num? " + ("num" in myObj));
// From Object.prototype
print("toString?" + ("toString" in myObj));
MyCons.prototype.sun = "a star";
MyCons.prototype.earth = "a planet";
print("foo? " + ("foo" in myObj));
print("func? " + ("func" in myObj));
print("num? " + ("num" in myObj));
print("sun? " + ("sun" in myObj));
print("earth? " + ("earth" in myObj));
print("toString? " + ("toString" in myObj));