#9091: print and/or apply constraints when showing info for typed holes --------------------------------------------+------------------------------ Reporter: kosmikus | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler (Type checker) | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by kosmikus): Yes, what you suggest would be fine. I don't attach much meaning to the word ``Given'', so I'd probably just say {{{ Constraints: Eq a }}} For example 2, I'd be happy with a very similar line saying {{{ Constraints: Eq a0 }}} The situation is different from Ex 1 in the sense that `Eq a` in Ex 1 is a constraint you can use, whereas `Eq a0` in Ex 2 is a constraint that you're required to adhere to while filling the hole. But this information is already available from the fact that `a0` in Ex 2 appears only in the type of the hole itself, so I think I'd be happy enough if the constraints are shown in the same way. For Ex 3, I'd like either {{{ Found hole ‘_’ with type: Int Relevant bindings include x :: Int (bound at THC.hs:13:5) }}} or {{{ Found hole ‘_’ with type: Int Relevant bindings include x :: a (bound at THC.hs:13:5) [...] Constraints: a ~ Int }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9091#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler