#11715: Constraint vs * -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.0.1-rc1 checker) | Resolution: | Keywords: Typeable Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by int-index): I see no need for writing a body neither for `reify` nor `with` -- just make them GHC primitives. As to what to do when multiple constraints are in scope, I think that GHC should refuse to compile: {{{ with (10 :: Int) $ with (20 :: Int) $ -- When GHC looks for an `Int` to satisfy -- the `Int =>` constraint, it finds both -- 10 and 20, so it's a compile-time error. (reify :: Int) }}} Am I missing something important? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11715#comment:19 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler