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.
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JSTests
/
es6
/
Array_is_subclassable_length_property_setting.js
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function
test
()
{
class
C extends
Array
{}
var
c
=
new
C
();
c
[
2
]
=
'foo'
;
c
.
length
=
1
;
return
c
.
length
===
1
&&
!(
2
in c
);
}
if
(!
test
())
throw
new
Error
(
"Test failed"
);