Re: [GHC] #16299: :info pretty-prints data types with non-Type return kinds oddly

#16299: :info pretty-prints data types with non-Type return kinds oddly -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: 8.10.1 Component: Compiler | Version: 8.6.3 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: | ghci/scripts/T7627 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | https://gitlab.haskell.org/ghc/ghc/merge_requests/343 -------------------------------------+------------------------------------- Comment (by Marge Bot ): In [changeset:"8b476d822e97cfe4cebe6e74924d9a79148d608c/ghc" 8b476d82/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="8b476d822e97cfe4cebe6e74924d9a79148d608c" Fix #16299 by deleting incorrect code from IfaceSyn GHCi's `:info` command was pretty-printing Haskell98-style data types with explicit return kinds if the return kind wasn't `Type`. This leads to bizarre output like this: ``` λ> :i (##) data (##) :: TYPE ('GHC.Types.TupleRep '[]) = (##) -- Defined in ‘GHC.Prim’ ``` Or, with unlifted newtypes: ``` λ> newtype T = MkT Int# λ> :i T newtype T :: TYPE 'IntRep = MkT Int# -- Defined at <interactive>:5:1 ``` The solution is simple: just delete one part from `IfaceSyn` where GHC mistakenly pretty-prints the return kinds for non-GADTs. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16299#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler