#7235: "panic!" when compiling happstack-server-7.0.4 ----------------------------------------------+---------------------------- Reporter: guest | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.4.2 Resolution: duplicate | Keywords: Operating System: Linux | Architecture: Type of failure: GHC rejects valid program | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ----------------------------------------------+---------------------------- Comment (by ivan.perez): I understand that this is an old, closed ticket, but I'm hitting this when I try to compile a package. I'm not sure it's the same bug. I'm on Ubuntu 12.10, I'm adding the package list that cabal selects so that you have more information about what I'm using. This is a fresh-new installation: I removed my .ghc and .cabal dirs before compiling this. {{{ Configuring postgresql-simple-0.3.7.1... Building postgresql-simple-0.3.7.1... Preprocessing library postgresql-simple-0.3.7.1... [...removed by me...] [26 of 32] Compiling Database.PostgreSQL.Simple.FromField ( src/Database/PostgreSQL/Simple/FromField.hs, dist/build/Database/PostgreSQL/Simple/FromField.o ) Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package array-0.4.0.1 ... linking ... done. Loading package deepseq-1.3.0.1 ... linking ... done. Loading package bytestring-0.10.2.0 ... linking ... done. Loading package postgresql-libpq-0.8.2.4 ... linking ... done. Loading package text-0.11.3.1 ... linking ... done. Loading package blaze-builder-0.3.1.1 ... linking ... done. Loading package old-locale-1.0.0.5 ... linking ... done. Loading package time-1.4.1 ... linking ... done. Loading package primitive-0.5.0.1 ... linking ... done. Loading package vector-0.10.0.1 ... linking ... done. Loading package blaze-textual-0.2.0.8 ... linking ... done. Loading package containers-0.5.3.1 ... linking ... done. Loading package attoparsec-0.10.4.0 ... linking ... done. Loading package dlist-0.5 ... linking ... done. Loading package hashable-1.1.2.5 ... linking ... done. Loading package transformers-0.3.0.0 ... linking ... done. Loading package mtl-2.1.2 ... linking ... done. Loading package syb-0.3.7 ... linking ... done. Loading package pretty-1.1.1.0 ... linking ... done. Loading package template-haskell ... linking ... done. Loading package unordered-containers-0.2.3.2 ... linking ... done. Loading package aeson-0.6.2.0 ... linking ... done. src/Database/PostgreSQL/Simple/FromField.hs:485:11:ghc: panic! (the 'impossible' happened) (GHC version 7.4.2 for x86_64-unknown-linux): Can't happen: pprExp (CompExp []) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7235#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler