This sounds like a thing that should be in the GHC API (the tyvar to provenance lookup).
Alan On Wed, Oct 19, 2016 at 2:48 PM, Richard Eisenberg <r...@cs.brynmawr.edu> wrote: > Interesting problem & solution. > > Here's a wacky idea, from a position of utter ignorance about your > environment: could you use color? Already, when I saw `b :: a` in the > commentary there, where `b` is in scope as a type variable, it seemed wrong > to me. > > In any case, I can answer your simpler question: yes, with some work, you > can get from a tyvar to its provenance. A tyvar's Name will have its > binding location in it. If you also keep track of binding locations as you > spot foralls, you should be able to match them up. In theory. > > Richard > > On Oct 19, 2016, at 7:45 AM, Christopher Done <chrisd...@gmail.com> wrote: > > We've encountered a problem in Intero which is that when inspecting types > of expressions and patterns, sometimes it happens that the type, when > pretty printing, yields variables of the same name but which have different > provenance. > > Here's a summary of the issue: > > https://github.com/commercialhaskell/intero/issues/280# > issuecomment-254784904 > > And a strawman proposal of how it could be solved: > > https://github.com/commercialhaskell/intero/issues/280# > issuecomment-254787927 > > What do you think? > > Also, if I were to implement the strawman proposal, is it possible to > recover from a `tyvar :: Type` its original quantification/its "forall"? > I've had a look through the API briefly and it looks like a _maybe_. > > Ciao! > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > > > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > >
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