Re: [GHC] #14880: GHC panic: updateRole

#14880: GHC panic: updateRole -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: goldfire Type: bug | Status: new Priority: normal | Milestone: 8.6.2 Component: Compiler (Type | Version: 8.2.2 checker) | Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: 15592 Related Tickets: #15076 | Differential Rev(s): Phab:D4769, | Phab:D5141, Phab:D5147, Phab:D5150, Wiki Page: | Phab:D5208 -------------------------------------+------------------------------------- Comment (by simonpj): This patch {{{ commit 4de4b2253caa685a39cc654d553cdf63b8babbee Author: Simon Peyton Jones Date: Thu Oct 25 15:16:19 2018 +0100 Fix generalisation for type constructors Fixing the way that we close-over-kinds when taking the free vars of a type revealed that the way we generalise type constructors was a bit wrong. This fixes it. See TcTyClDecls Note [Generalisation for type constructors]

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4de4b2253caa685a39cc654d553cdf63b8babbee compiler/typecheck/TcTyClsDecls.hs | 58 +++++++++++++++++++++--- compiler/typecheck/TcValidity.hs | 92 +++++++++++++++----------------------- 2 files changed, 86 insertions(+), 64 deletions(-) }}} turned out to be necessary as a precursor to the patch in comment:153. The lack of it was the reason for the two validation failures mentioned in comment:152. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14880#comment:155 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler