I think we should drop the feature. Given the conflict between * the history of ** in other languages, * the general pattern that unary binds tighter than binary
any solution at this point will confuse many people. These confusions will not result in a confusing static rejection but in runtime behavior that *sometimes* violates expectations. I was all for adding ** to the language when it did not have these problems. But it does. The minor convenience it adds is not worth these costs. By contrast, no one is confused about the parsing of calls to Math.pow. When in doubt, leave it out.
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