This repository contains a reproduction for an annoying error I got while using doctest
in a test-suite.
cabal-install
s solver fails to find a solution for this build-depends
field using GHC 8.0.2:
build-depends:
base >= 4.7 && < 5
, doctest == 0.11.4
, containers == 0.5.10.2
Note that doctest
depends transitively depends on ghc-8.0.2
, which itself depends on containers-0.5.7.1
, conflicting with my own constraints.
That's basically what cabal install
is trying to tell me:
Resolving dependencies...
cabal.exe: Could not resolve dependencies:
next goal: containers (dependency of repro-0.1.0.0)
rejecting: containers-0.5.7.1/installed-0.5... (conflict: repro =>
containers==0.5.10.2)
trying: containers-0.5.10.2
next goal: doctest (dependency of repro-0.1.0.0)
rejecting: doctest-0.13.0, doctest-0.12.0 (conflict: repro => doctest==0.11.4)
trying: doctest-0.11.4
next goal: ghc (dependency of doctest-0.11.4)
rejecting: ghc-8.0.2/installed-8.0... (conflict: containers==0.5.10.2, ghc =>
containers==0.5.7.1/installed-0.5...)
Dependency tree exhaustively searched.
Now, what bugs me is that stack install
works just fine using lts-9
and an extra-deps
for the containers version.
So in theory, cabal-install
could also do 'the right thing' here. How can I tell it to?