That line of code looks like it came directly from a test I wrote for
kangax's ES6 compatibility table.
Let's look at the test in its entirety:
```
try { eval('for (var i = 0 in {}) {}'); } catch(e) { return true; }
```
The grammer you describe is correct: ES6 no longer supports this useless
form. So, a conforming implementation must throw an error when the eval()
string is evaluated. If it does so, the test returns `true`, signifiying
conforming support.
I hope that answers your question - and pardon my presumptions if this test
code wasn't what you were thinking of at all.
-Leon.
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