#11427: TypeSynonyms not deduced -------------------------------------+------------------------------------- Reporter: phadej | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1-rc1 Resolution: | Keywords: 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 phadej): Ok, so this is special case which has a elegent-enough workaround. I guess the error message could be better: {{{ • Could not deduce (SListI xss) arising from the superclasses of an instance declaration from the context: All SListI xss bound by the instance declaration at foo.hs:39:3-40 Note: superclasses of (All SListI xss) aren't considered, because it's no smaller then the instance head. }}} or some variation of that. ''arising from the superclasses of an instance'' is a bit misleading in this case. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11427#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler