A 7.7 snapshot would be useful for me in a number of ways:
a) I often spend some time prior to recent GHC releases trying to build all the various major packages, and often send in patches to maintainers during that window (or at least the start of patches). Having a fixed snapshot release that maintainers can use to validate any such future proofing patches would be tremendously helpful
b) Theres a bunch of engineering i'm currently up where I want to use some of the features very soon, and making it easier for other people to use the open source subsets of that engineering sooner rather than later would be valuable!
c) lowering the barrier to folks using and stress testing these features may catch problems sooner.
note: i'm ok with compiling ghc from source, but many people who might be happy to test those new features might find that a bit daunting the first time.
cheers
-Carter