#12925: GHC panic: Can't serialise IfaceTcTyVar -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): So you have this in your tree? {{{ commit f8c8de8ebf73cd77faa0249d92f280e33a8d2624 Author: Simon Peyton Jones <simonpj@microsoft.com> Date: Tue Nov 29 14:03:46 2016 +0000 Zonk the free tvs of a RULE lhs to TyVars }}} If not, that should fix it. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12925#comment:1> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler