Re: [GHC] #7939: RHS of associated type not kind-checked

#7939: RHS of associated type not kind-checked ------------------------------------------+--------------------------------- Reporter: goldfire | Owner: goldfire Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: GHC accepts invalid program | Difficulty: Unknown Testcase: ghci/scripts/T7939 | Blockedby: Blocking: | Related: ------------------------------------------+--------------------------------- Comment(by eir@…): commit 8c5e7346746a870ccc2eb86747792700f2a08deb {{{ Author: Richard Eisenberg Date: Tue Jun 25 17:42:47 2013 +0100 Fix Trac #7939, and add kind inference to closed type families. Now, all open type families have result kinds that default to *. Top-level type families have all arguments default to *, and associated type families have all arguments that are not mentioned in the class header default to *. Closed type families perform kind inference, but generalize only over those kind variables that are parametric in their use. This is all a little fiddly and specific, but it seems to follow use cases. This commit also includes a large Note [Kind-checking strategies] in TcHsType that helps keep all of this straight. compiler/hsSyn/HsDecls.lhs | 12 ++ compiler/typecheck/TcHsType.lhs | 224 ++++++++++++++++++++++++++++++++-- compiler/typecheck/TcMType.lhs | 11 +-- compiler/typecheck/TcTyClsDecls.lhs | 210 +++++++++++++++++++-------------- 4 files changed, 345 insertions(+), 112 deletions(-) }}} -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7939#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler