#12158: ghc: panic! (the 'impossible' happened) translateConPatVec: lookup -------------------------------------+------------------------------------- Reporter: wozgonon | Owner: gkaracha Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 8.0.1 Resolution: | Keywords: | PatternMatchWarnings Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: #13644 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by justus): I have another example of this error: {{{#!hs genExampleBenchmark :: Int -> LGCmdArgs -> [(String, Serialized)] genExampleBenchmark seed lgArgs@(LGCmdArgs { totalGraphs = total , language = lang , slowdatasource = slowDS , cachenum = cache , LG.percentages = p }) = ... }}} Here I use `LG.percentages` to disambiguate between two `percentages` record fields that are in scope, but it still fails with the same error. Btw if I remove the `LG.` it does throw the appropriate error telling me that it is an ambiguous reference. Commenting out `LG.percentages` makes the panic disappear. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12158#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler