I think you wanted v1-install to install a library into the user package database, since your cabal is 3.x and the v2-* commands are now the default (that is, you did what used to be cabal new-install or cabal v2-install). On Mon, Apr 15, 2019 at 5:47 PM Simon Peyton Jones via ghc-devs < ghc-devs@haskell.org> wrote:
I’m trying to install ‘hspec’ on my WSL (Windows subsystem for Linux) system.
But I fail; see below.
For some reason cabal complains about installing a library. (That seems peculiar – isn’t that what cabal is for?) But it helpfully suggests adding –lib.
Alas, cabal then crashes outright, which should never happen.
So I’m stuck. What should I do?
Thanks
Simon
simonpj@MSRC-9870733:~$ cabal --version
cabal-install version 3.0.0.0
compiled using version 3.0.0.0 of the Cabal library
simonpj@MSRC-9870733:~$ cabal install hspec
Resolving dependencies...
Up to date
Warning: You asked to install executables, but there are no executables in
target: hspec. Perhaps you want to use --lib to install libraries instead.
simonpj@MSRC-9870733:~$ cabal install --lib hspec
Resolving dependencies...
Up to date
Distribution/Simple/GHC.hs:1959:5-56: Irrefutable pattern failed for pattern Just ghcPkgProg
simonpj@MSRC-9870733:~$ which ghc
/opt/ghc/bin/ghc
simonpj@MSRC-9870733:~$ which ghc-pkg
/opt/ghc/bin/ghc-pkg
simonpj@MSRC-9870733:~$
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