Fact: Adding a new name for a special kind of function as a syntax construct is going to cost (possibly unnecessary) time and energy, because now you have functions, and weird things that look almost like functions but aren't and can only be used to make generators.
Just to put my oar in too, as an interested watcher...
I don't think that it's a problem (from that point of view) to have a generator keyword. Explicitly declaring up front that it's a generator means that the "return" keyword in the body is always a mistake. Likewise with "function" and "yield". I don't think it would be confusing to have something that looks like a function but isn't completely the same. In fact, it's almost (but not quite) like declaring a return type for the function.
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