#15716: GHC hangs on default implementation of type family -------------------------------------+------------------------------------- Reporter: Heimdell | Owner: (none) Type: bug | Status: new Priority: high | Milestone: Component: Compiler | Version: 8.4.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by int-index): I cannot reproduce the hang on 8.4.3, I get an error instead: {{{ A.hs:10:28: error: • Expecting one more argument to ‘ExceptT (Error comp)’ Expected kind ‘* -> *’, but ‘ExceptT (Error comp)’ has kind ‘(* -> *) -> * -> *’ • In the type ‘ExceptT (Error comp)’ In the default type instance declaration for ‘ComponentT’ In the class declaration for ‘Component’ | 10 | type ComponentT comp = ExceptT (Error comp) | }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15716#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler