arai-a

currently we're not emitting different bytecode for empty-then-clause case, but we might be able to emit somewhat optimized code (like, flipping the condition and reduce the number of jumps), and...

test is in https://github.com/tc39/test262/pull/2910. According to the result there, most engines follow current spec (create `thenFinally` and `catchFinally` in `finally` method's realm) and don't match to the modified behavior. As...

no, this issue is about the error message and how it's displayed, not about the specific error fixed by https://github.com/mozilla-services/screenshots/commit/5d04ef1d7ac52aa181760fd5279a89e69f9691c5