Hey Everyone, in https://ghc.haskell.org/trac/ghc/ticket/9353 and https://phabricator.haskell.org/D350 is some preliminary work to fix up how the pure versions of the prefetch primops work is laid out and prototyped. However, while it nominally fixes up some of the problems with how the current pure prefetch apis are fundamentally borken, the simple design in D350 isn't quite ideal, and i sketch out some other ideas in the associated ticket #9353 I'd like to make sure pure prefetch in 7.10 is slightly less broken than in 7.8, but either way, its pretty clear that working out the right fixed up design wont happen till 7.12. Ie, whatever makes 7.10, there WILL have to be breaking changes to fix those primops for 7.12 thanks and any feedback / thoughts appreciated -Carter