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JSTests
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es6
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Array_is_subclassable_Array.prototype.concat.js
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function
test
()
{
class
C extends
Array
{}
var
c
=
new
C
();
return
c
.
concat
(
1
)
instanceof C
;
}
if
(!
test
())
throw
new
Error
(
"Test failed"
);