RE: [commit: ghc] wip/generics-flip: Flip around imports of GHC.Generics (cb12bdf)

Simon Peyton Jones via ghc-devs writes:

I don’t object to this, but I suspect that it's just covering up some other bug.

Indeed, I concluded the same after our chat today. I've made a bit of progress tracking down the cause of GHC.Generics being loaded when looking for a `Foldable []` instance. It looks like the cause is the evaluation of the `mod` binding in IfaceEnv.instIsVisible. The RHS of this binding pulls on is_dfun to get its `idName` (which it only need the Module from). I'm afraid I'll need to pick this up tomorrow though; it's getting rather late. I'll paste the above in the ticket to ensure it isn't lost. Cheers, - Ben