This problem is described in a Stackage Server issue, but the problem should really be reported here. The problem is this:
library a
library b depends on a
benchmarks for library a depend on a and b
stack bench a results in the error:
> stack bench a
...
Preprocessing library a-0.0.1...
Preprocessing benchmark 'a-benches' for a-0.0.1...
<command line>: cannot satisfy -package-id b-0.0.1-2uppVa4SsB06R8hiHGD1I8:
b-0.0.1-2uppVa4SsB06R8hiHGD1I8 is unusable due to shadowed dependencies:
a-0.0.1-B41UI81aQaCEjW3sk56eaB
(use -v for more information)
Progress: 3/4
-- While building package a-0.0.1 using:
/home/eric/.stack/setup-exe-cache/x86_64-linux/setup-Simple-Cabal-1.24.0.0-ghc-8.0.1 --builddir=.stack-work/dist/x86_64-linux/Cabal-1.24.0.0 build bench:a-benches --ghc-options " -ddump-hi -ddump-to-file"
Process exited with code: ExitFailure 1
Note that the benchmarks compile if a-benches only depends on a or b, but not both. I don't see any reason why the benchmarks should fail to compile when they depend on both a and b; it's clear what the compilation order should be.
As indicated in the Stackage Server issue, this problem affects many packages including
A minimal example is in shadowed-deps.tar.gz.
jberryman, parsonsmatt, ip1981, ntc2 and chshersh
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