[Haskell-cafe] <package>-inplace is shadowed by package <package>-<hexstring>

[Alexander Bernauer]

Hi

I am trying to write criterion benchmarks for the pretty library.
Unfortunately, building the benchmark executable fails at some point
during the development with the following error message:

---8<---
<command line>: cannot satisfy -package-id pretty-1.1.1.1-inplace:
    pretty-1.1.1.1-inplace is shadowed by package
pretty-1.1.1.1-7bd0114e9691fca3d3447fc0133701cf
--->8---

I don't understand the cause of the error, let alone what I am
supposed to do next. Any help is much appreciated.

Here are the steps that lead to the above quoted error. Sorry, if this
is not the smallest counter example possible. As I said, I hardly
understand what is going on.

(the two patch files mentioned are attached to this email, virthualenv
is version 0.2.1)
---8<---
git clone https://github.com/haskell/pretty.git
cd pretty
git apply /tmp/0001-hello-world-setup.patch
export PATH=/opt/ghc-7.4.2/install/bin:/opt/haskell-platform-2012.4.0.0/install/bin:$PATH
~/.cabal/bin/virthualenv
source .virthualenv/bin/activate

cabal configure --user
cabal build
cabal install

cabal install criterion
cabal configure --user --enable-benchmarks
cabal build

git apply /tmp/0002-replaced-example-with-real-benchmark.patch
cabal install language-c
cabal configure --user --enable-benchmarks
cabal build
# error
--->8---

So the first build of the benchmark executable works, but the second
one "suddenly" fails.

Executing "cabal build -v" next yields
---8<---
$ cabal build -v
creating dist/build
creating dist/build/autogen
Building pretty-1.1.1.1...
Preprocessing library pretty-1.1.1.1...
Building library...
creating dist/build
/opt/ghc-7.4.2/install/bin/ghc --make -package-name pretty-1.1.1.1
-hide-all-packages -fbuilding-cabal-package -package-conf
/home/alex/tmp/pretty/.virthualenv/ghc_pkg_db -i -idist/build -isrc
-idist/build/autogen -Idist/build/autogen -Idist/build -optP-include
-optPdist/build/autogen/cabal_macros.h -odir dist/build -hidir
dist/build -stubdir dist/build -package-id
base-4.5.1.0-66f22db3dfcd87541c9c7e50e7095d26 -O -Wall -fwarn-tabs
-XHaskell98 -XCPP -XBangPatterns Text.PrettyPrint
Text.PrettyPrint.HughesPJ
Linking...
/usr/bin/ar -r dist/build/libHSpretty-1.1.1.1.a
dist/build/Text/PrettyPrint.o dist/build/Text/PrettyPrint/HughesPJ.o
/usr/bin/ar: creating dist/build/libHSpretty-1.1.1.1.a
/usr/bin/ld -x --hash-size=31 --reduce-memory-overheads -r -o
dist/build/HSpretty-1.1.1.1.o dist/build/Text/PrettyPrint.o
dist/build/Text/PrettyPrint/HughesPJ.o
Registering pretty-1.1.1.1...
/opt/ghc-7.4.2/install/bin/ghc-pkg update - --global --user
--package-conf=/home/alex/tmp/pretty/.virthualenv/ghc_pkg_db
--package-conf=dist/package.conf.inplace
Preprocessing benchmark 'bench-pretty' for pretty-1.1.1.1...
Building benchmark bench-pretty...
creating dist/build/bench-pretty
creating dist/build/bench-pretty/bench-pretty-tmp
/opt/ghc-7.4.2/install/bin/ghc --make -o
dist/build/bench-pretty/bench-pretty -hide-all-packages
-fbuilding-cabal-package -package-conf
/home/alex/tmp/pretty/.virthualenv/ghc_pkg_db -package-conf
dist/package.conf.inplace -i
-idist/build/bench-pretty/bench-pretty-tmp -ibench
-idist/build/autogen -Idist/build/autogen
-Idist/build/bench-pretty/bench-pretty-tmp -optP-include
-optPdist/build/autogen/cabal_macros.h -odir
dist/build/bench-pretty/bench-pretty-tmp -hidir
dist/build/bench-pretty/bench-pretty-tmp -stubdir
dist/build/bench-pretty/bench-pretty-tmp -package-id
base-4.5.1.0-66f22db3dfcd87541c9c7e50e7095d26 -package-id
criterion-0.6.2.1-5ae981935ea0c9773e0df464b5922b27 -package-id
language-c-0.4.2-fe58279e43af097994ce7b7010785c69 -package-id
pretty-1.1.1.1-inplace -O -O -XHaskell98 bench/Bench.hs
<command line>: cannot satisfy -package-id pretty-1.1.1.1-inplace:
    pretty-1.1.1.1-inplace is shadowed by package
pretty-1.1.1.1-7bd0114e9691fca3d3447fc0133701cf
    (use -v for more information)
--->8---

What does this mean? What am I doing wrong? How can I fix this?

Greetings, Alex
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