"panic!" when compiling happstack-server-7.0.4

I wanted to install happstack-server-7.0.4 for a project, then the compiler told me to file this as a bug:

$ cabal-dev install happstack-server-7.0.4
Resolving dependencies...
Configuring happstack-server-7.0.4...
Building happstack-server-7.0.4...
Preprocessing library happstack-server-7.0.4...
[ 1 of 38] Compiling Happstack.Server.Internal.LazyLiner ( src/Happstack/Server/Internal/LazyLiner.hs, dist/build/Happstack/Server/Internal/LazyLiner.o )
[ 2 of 38] Compiling Happstack.Server.Internal.SocketTH ( src/Happstack/Server/Internal/SocketTH.hs, dist/build/Happstack/Server/Internal/SocketTH.o )
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package bytestring-0.9.2.1 ... linking ... done.
Loading package zlib-0.5.3.3 ... linking ... done.
Loading package xhtml-3000.2.1 ... linking ... done.
Loading package utf8-string-0.3.7 ... linking ... done.
Loading package array-0.4.0.0 ... linking ... done.
Loading package deepseq-1.3.0.0 ... linking ... done.
Loading package containers-0.5.0.0 ... linking ... done.
Loading package pretty-1.1.1.0 ... linking ... done.
Loading package template-haskell ... linking ... done.
Loading package text-0.11.2.3 ... linking ... done.
Loading package system-filepath-0.4.7 ... linking ... done.
Loading package syb-0.3.7 ... linking ... done.
Loading package transformers-0.3.0.0 ... linking ... done.
Loading package mtl-2.1.2 ... linking ... done.
Loading package parsec-3.1.3 ... linking ... done.
Loading package unix-2.5.1.1 ... linking ... done.
Loading package network-2.3.1.0 ... linking ... done.
Loading package sendfile-0.7.6 ... linking ... done.
Loading package base-unicode-symbols-0.2.2.4 ... linking ... done.
Loading package transformers-base-0.4.1 ... linking ... done.
Loading package monad-control-0.3.1.4 ... linking ... done.
Loading package html-1.0.1.2 ... linking ... done.
Loading package filepath-1.3.0.0 ... linking ... done.
Loading package old-locale-1.0.0.4 ... linking ... done.
Loading package old-time-1.1.0.0 ... linking ... done.
Loading package directory-1.1.0.2 ... linking ... done.
Loading package process-1.1.0.1 ... linking ... done.
Loading package time-1.4 ... linking ... done.
Loading package hslogger-1.2.0 ... linking ... done.
Loading package extensible-exceptions-0.1.1.4 ... linking ... done.
Loading package blaze-builder-0.3.1.0 ... linking ... done.
Loading package blaze-markup-0.5.1.0 ... linking ... done.
Loading package blaze-html-0.5.1.0 ... linking ... done.
Loading package base64-bytestring-0.1.2.0 ... linking ... done.
[ 3 of 38] Compiling Happstack.Server.Internal.Socket ( src/Happstack/Server/Internal/Socket.hs, dist/build/Happstack/Server/Internal/Socket.o )

src/Happstack/Server/Internal/Socket.hs:66:7:ghc: panic! (the 'impossible' happened)
  (GHC version 7.4.2 for x86_64-unknown-linux):
	Can't happen: pprExp (CompExp [])

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

cabal: Error: some packages failed to install:
happstack-server-7.0.4 failed during the building phase. The exception was:
ExitFailure 1

I get the exact same output for happstack-server-7.0.3 as well. I am quite stumped with this one because just minutes ago, I was able to compile it just fine.

Trac metadata

Trac field	Value
Version	7.4.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	lambdadusk@gmail.com
Operating system
Architecture