#11523: Infinite Loop when mixing UndecidableSuperClasses and the class/instance constraint synonym trick. -------------------------------------+------------------------------------- Reporter: ekmett | Owner: simonpj Type: bug | Status: new Priority: high | Milestone: 8.4.1 Component: Compiler (Type | Version: 8.0.1-rc1 checker) | Keywords: Resolution: | UndecidableSuperClasses Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: GHC rejects | Test Case: valid program | polykinds/T11523 Blocked By: | Blocking: Related Tickets: #11480 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by aaronvargo): Are `QuantifiedConstraints` another thing to consider here? The proposed magic would properly account for them as well, while the current rules presumably ignore them the same way they ignore top-level instances. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11523#comment:30 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler