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JSTests
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es6
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miscellaneous_subclassables_Number_is_subclassable.js
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function
test
()
{
class
C extends
Number
{}
var
c
=
new
C
(
6
);
return
c instanceof
Number
&&
+
c
===
6
;
}
if
(!
test
())
throw
new
Error
(
"Test failed"
);