#9693: Reloading GHCi with Template Haskell names can panic GHC -------------------------------------+------------------------------------- Reporter: maxs | Owner: Type: bug | Status: new Priority: high | Milestone: Component: Template Haskell | Version: 7.8.3 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: | -------------------------------------+------------------------------------- Changes (by thomie): * priority: normal => high Comment: Still reproducible with HEAD. The first error (that you should ignore) is now: {{{ thbug.hs:4:1: error: Same exact name in multiple name-spaces: type constructor or class ‘X’, declared at: thbug.hs:4:1 data constructor ‘X’, declared at: thbug.hs:4:1 Probable cause: you bound a unique Template Haskell name (NameU), perhaps via newName, in different name-spaces. If that's it, then -ddump-splices might be useful }}} And the panic: {{{ ghc: panic! (the 'impossible' happened) (GHC version 7.11.20151213 for x86_64-unknown-linux): kcLookupKind APromotionErr RecDataConPE }}} Panics are bad, raising priority. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9693#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler