The fact that {-# complete #-} pragma that was added in#8779 is tied to the set of patterns only and not the types involved can make it rather awkward or impossible to use in practice.

Say I have a bunch of types that happen to share a common (:<) and Empty pattern, for views. I'd like to be able to say that for one particular type {-# complete (:<), Empty #-} holds, but since both aren't defined in the same module and neither one mentions my type, I'm stuck in the same -Wno-incomplete-patterns mess I was in before.

I cant move the pragma to the individual view patterns because in general they aren't known to be a complete pattern set.