Ideally it shouldn’t, because its twin `for (var a in null) {}` won’t.
But looking at step 8 in
https://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-forin-div-ofexpressionevaluation-abstract-operation
<https://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-forin-div-ofexpressionevaluation-abstract-operation>,
when passing `null` to `GetIterator()`, it will throw a type error when the
result of step 2 `CheckIterable(null)`, which is `undefind`, is called in step
3 in the algorithm for `GetIterator()`.
Did I miss something or the current spec does throw an error?
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