#13255: aws package fails to build with master -------------------------------------+------------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: 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 RyanGlScott): Yep, a profiled GHC HEAD is crucial here. I couldn't reproduce this with a profiled 8.0.2, but with a profiled GHC HEAD, I get: {{{ $ cabal build Building aws-0.16... Preprocessing library aws-0.16... [69 of 78] Compiling Aws.DynamoDb.Core ( Aws/DynamoDb/Core.hs, dist/build/Aws/DynamoDb/Core.p_o ) <no location info>: error: ghc-stage2: panic! (the 'impossible' happened) (GHC version 8.1.20170213 for x86_64-unknown-linux): completeCall $wloop_length_s1bOu Stop[BoringCtxt] Int# -> Int# -> Int Call stack: CallStack (from HasCallStack): prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1197:58 in ghc:Outputable callStackDoc, called at compiler/utils/Outputable.hs:1201:37 in ghc:Outputable pprPanic, called at compiler/simplCore/Simplify.hs:1598:9 in ghc:Simplify CallStack (from -prof): SimplCore.SimplTopBinds (compiler/simplCore/SimplCore.hs:729:29-64) SimplCore.Simplify (compiler/simplCore/SimplCore.hs:426:40-55) HscMain.Core2Core (compiler/main/HscMain.hs:1170:7-42) HscMain.hscSimplify' (compiler/main/HscMain.hs:(1167,1)-(1170,42)) HscMain.finish (compiler/main/HscMain.hs:(728,1)-(740,20)) HscMain.hscIncrementalCompile (compiler/main/HscMain.hs:(639,1)-(694,32)) GhcMake.upsweep_mod.compile_it (compiler/main/GhcMake.hs:(1380,13)-(1382,66)) GhcMake.upsweep_mod (compiler/main/GhcMake.hs:(1328,1)-(1482,49)) GhcMake.parUpsweep_one.withSem (compiler/main/GhcMake.hs:1104:13-66) GhcMake.parUpsweep_one (compiler/main/GhcMake.hs:(1009,1)-(1164,65)) GhcMake.parUpsweep.\.spawnWorkers.\.\ (compiler/main/GhcMake.hs:(867,43)-(918,49)) GhcMake.parUpsweep.\.spawnWorkers.\ (compiler/main/GhcMake.hs:(867,13)-(918,49)) GhcMake.parUpsweep.\.spawnWorkers (compiler/main/GhcMake.hs:(866,11)-(918,49)) GhcMake.parUpsweep.\.finallySyncSession (compiler/main/GhcMake.hs:(832,9)-(834,30)) GhcMake.parUpsweep.\ (compiler/main/GhcMake.hs:(829,62)-(949,44)) GhcMake.parUpsweep (compiler/main/GhcMake.hs:(796,1)-(979,36)) GhcMake.load'.upsweep_fn (compiler/main/GhcMake.hs:(351,9)-(352,41)) GhcMake.load'.checkHowMuch (compiler/main/GhcMake.hs:(233,9)-(235,27)) GhcMake.load' (compiler/main/GhcMake.hs:(210,1)-(439,38)) GhcMake.load (compiler/main/GhcMake.hs:(202,1)-(204,44)) GHC.withCleanupSession (compiler/main/GHC.hs:(450,1)-(459,37)) GHC.runGhc (compiler/main/GHC.hs:(425,1)-(430,26)) GHC.defaultErrorHandler (compiler/main/GHC.hs:(365,1)-(397,7)) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13255#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler