#11621: GHC doesn't see () as a Constraint in type family -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 7.10.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #11715 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * related: => #11715 Comment: Replying to [comment:3 spacekitteh]:
Has this been fixed?
No. {{{ GHCi, version 8.3.20170516: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/rgscott/.ghci [1 of 1] Compiling Main ( Bug.hs, interpreted ) Bug.hs:10:14: error: • Expected a constraint, but ‘()’ has kind ‘*’ • In the type ‘()’ In the type family declaration for ‘F’ | 10 | F 'True = () | ^^ }}} Again, this probably requires fixing #11715 first. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11621#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler