> On May 5, 2020, at 04:00, Richard Eisenberg <r...@richarde.dev> wrote: > > reportWanteds reports errors, yes, but it also fills in deferred type errors. > [snip] It's a bit awkward that a function called reportWanteds does this, but > it actually makes good sense, because reportWanteds knows the text that > should be in the runtime error call.
Yes, that does make sense; thank you for the explanation. > You say that they're not, in general, fully known. But are they often known > in practice? My suggestion here isn't to remove the type families entirely, > but maybe to short-circuit around them. If that's often possible, it takes > some pressure off fixing the pretty-printing. You’re right that this might be feasible, but I think it would be awkward, and it probably would break down just often enough to be an unsatisfying solution. > I wonder if we should have a preprocessTypeForPrinting :: DynFlags -> Type -> > Type function. This could be run *before* the conversion to IfaceType. It > could handle both your new idea and the existing idea for > -f(no-)print-explicit-runtime-reps. The supplied DynFlags could be gotten > from sdocWithDynFlags, I think. I bet that once we have this facility > working, we'll find more uses for it. If you think this is a reasonable idea, I’m happy to give it a shot—it definitely seems like the nicest way to do it to me. I’ll try it out and report back if I run into any trouble. Thanks again! Alexis _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
