#8264: Canonical way to prevent manual instances --------------------------------------------+------------------------------ Reporter: nomeata | Owner: Type: task | Status: new Priority: normal | Milestone: Component: Compiler (Type checker) | Version: 7.6.3 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 monoidal): I don't know internals, but this mechanism might also work for `(~)` and `(<=)` constraints (type-level naturals inequality). Currently they give "Malformed instance" error. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8264#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler