#11523: Infinite Loop when mixing UndecidableSuperClasses and the class/instance constraint synonym trick. -------------------------------------+------------------------------------- Reporter: ekmett | Owner: Type: bug | Status: new Priority: highest | Milestone: 8.0.1 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 simonpj): comment:14 explains why there is no fixed point. Did the explanation make sense? Do you think there is a fixed point? The existence or otherwise of a fixpoint should not be related to how you use constraints. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11523#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler