#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 simonpj):
One remaining problem is that GHC uses newtype axioms for substitutions in, e.g., newtype unwrapping/normalization. So a heterogeneous axiom is a bad idea
Can you give an example? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11715#comment:48 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler