#16013: :kind! accepts unsaturated type aliases -------------------------------------+------------------------------------- Reporter: dmwit | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.3 Component: Compiler | Version: 8.4.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #13962 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * related: => #13962 Comment: `:kind` deliberately allows unsaturated uses of type synonyms and type families—see [https://downloads.haskell.org/~ghc/8.6.3/docs/html/users_guide/ghci.html #ghci-cmd-:kind this section] of the users' guide. Many folks find it quite handy to be able to query the kinds of type synonyms with `:kind` (e.g., `:kind Id`), but disallowing unsaturated type synonyms/families //carte blanche// would prevent `:kind Id` from working, so a special case was added to allow it in that particular scenario. (Also note that this has been previously discussed in #13962.) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16013#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler