#15791: typeKind confuses Type and Constraint -------------------------------------+------------------------------------- Reporter: goldfire | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Branch: Wiki Page: | wip/T15791 -------------------------------------+------------------------------------- Comment (by simonpj): Fixed by this commit (though I put the wrong ticket number in the commit message). In [changeset:"03d4852658e1b7407abb4da84b1b03bfa6f6db3b/ghc" 03d48526/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="03d4852658e1b7407abb4da84b1b03bfa6f6db3b" Introduce tcTypeKind, and use it In the type checker Constraint and * are distinct; and the function that takes the kind of a type should respect that distinction (Trac #15971). This patch implements the change: * Introduce Type.tcTypeKind, and use it throughout the type inference engine * Add new Note [Kinding rules for types] for the kinding rules, especially for foralls. * Redefine isPredTy ty = tcIsConstraintKind (tcTypeKind ty) (it had a much more complicated definition before) Some miscellaneous refactoring * Get rid of TyCoRep.isTYPE, Kind.isTYPEApp, in favour of TyCoRep.kindRep, kindRep_maybe * Rename Type.getRuntimeRepFromKind_maybe to getRuntimeRep_maybe I did some spot-checks on compiler perf, and it really doesn't budge (as expected). }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15791#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler