#14339: GHC 8.2.1 regression when combining GND with TypeError (solveDerivEqns: probable loop) -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.4.1 Component: Compiler (Type | Version: 8.2.1 checker) | Keywords: deriving, Resolution: | CustomTypeErrors Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Simon Peyton Jones <simonpj@…>): In [changeset:"13fdca3d174ff15ac347c5db78370f457a3013ee/ghc" 13fdca3d/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="13fdca3d174ff15ac347c5db78370f457a3013ee" Add a missing zonk in TcDerivInfer.simplifyDeriv I'm astonished that anything worked without this! Fixes Trac #14339 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14339#comment:3> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler