#10586: GHC 7.10.1 panic due to wildcard in data family instance -------------------------------------+------------------------------------- Reporter: WrenThornton | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #3699 | Differential Revisions: -------------------------------------+------------------------------------- Comment (by simonpj): Follow the pattern in `TcHsType.tcHsTyVarBndr` (which in any case is probably the function you'll need to modify). It uses `mkTcTyVar` as far as I can see. Just do the same, but with a fresh `Name`. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10586#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler