How about `tc_tuple`?
On Tue, Jun 19, 2018 at 2:53 PM, Ryan Scott <ryan.gl.sc...@gmail.com> wrote: > I'm currently working on some code in which I need to produce a Core Type > that mentions a constraint tuple. I thought that there must surely exist > some way to construct a constraint tuple using the GHC API, but to my > astonishment, I could not find anything. The closest thing I found was > mk_tuple [1], which gives you the ability to make boxed and unboxed tuples, > but not constraint tuples. > > I then thought to myself, "But wait, PartialTypeSignatures has to create > constraint tuples, right? How does that part of the code work?" To my > horror, I discovered that PartialTypeSignatures actually creates *boxed* > tuples (see mk_ctuple here [2]), then hackily treats them as constraint > tuples, as explained in Note [Extra-constraint holes in partial type > signatures] [3]. I tried reading that Note, but I couldn't follow the > details. > > Is there a simpler way to create a constraint tuple that I'm not aware of? > > Ryan S. > ----- > [1] > http://git.haskell.org/ghc.git/blob/676c5754e3f9e1beeb5f01e0265ffbdc0e6f49e9:/compiler/prelude/TysWiredIn.hs#l810 > [2] > http://git.haskell.org/ghc.git/blob/676c5754e3f9e1beeb5f01e0265ffbdc0e6f49e9:/compiler/typecheck/TcBinds.hs#l1036 > [3] > http://git.haskell.org/ghc.git/blob/676c5754e3f9e1beeb5f01e0265ffbdc0e6f49e9:/compiler/typecheck/TcHsType.hs#l2367 > > _______________________________________________ > 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
