Chris Lattner: “Because proposals must be implemented before review, the core team is pre-reviewing proposals to provide guidance of whether they are conceptually plausible for inclusion in swift. This is to avoid the problem of someone spending a bunch of time implementing something, then the core team saying ‘no, that's a bad idea’”
David Hart: “To be clear: proposals need an implementation but its not important who implements it. The core team has also implied that they might help pair proposal authors with implementors, so I wouldn't worry about that part.”
