Aha! That works. I would never in a million years have found that by myself. Thank you.
But
* It is terribly mysterious that “cabal install hspec” doesn’t, well, install hspec.
* It must surely be a bug that “cabal install –lib hspec” simply crashes.
Simon
From: Brandon Allbery
Sent: 15 April 2019 23:03
To: Simon Peyton Jones
Cc: ghc-devs@haskell.org
Subject: Re: Cabal woes
Yes, I think a lot of documentation will need to be updated because this. You want "cabal v1-install" with cabal 3.
On Mon, Apr 15, 2019 at 6:00 PM Simon Peyton Jones mailto:simonpj@microsoft.com> wrote:
Thanks. But alas I have no clue about whether I want a v1-install or a v2-install, nor how to achieve them if I knew what they were. I just want to install ‘hspec’ so that I can use it when compiling a program. How would I do that?
The instructions here https://wiki.haskell.org/Cabal-Installhttps://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.haskell.org%2FCabal-Install&data=02%7C01%7Csimonpj%40microsoft.com%7C9dba03cd18af405d806208d6c1ee1601%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909625657350786&sdata=81SaQYxWkpF9nYalL%2B%2FSCbcGMMkYsMnFnpylDncDXu0%3D&reserved=0 just say “cabal install hspec” which is what I tried. Those instructions are pointed to from here https://wiki.haskell.org/Cabal/How_to_install_a_Cabal_packagehttps://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.haskell.org%2FCabal%2FHow_to_install_a_Cabal_package&data=02%7C01%7Csimonpj%40microsoft.com%7C9dba03cd18af405d806208d6c1ee1601%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909625657350786&sdata=ougOkZ0Dd%2Fep%2FshvVChLiGb9MEhEOW1sYxGnK8KJ8ww%3D&reserved=0, which in turn are pointed to from the main Cabal home page https://www.haskell.org/cabal/https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.haskell.org%2Fcabal%2F&data=02%7C01%7Csimonpj%40microsoft.com%7C9dba03cd18af405d806208d6c1ee1601%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909625657360794&sdata=I1SnV%2F4c2d05K39NLK%2FQ%2BLdfRoGRRCcKIGXHkNKMGH8%3D&reserved=0.
I must be missing something.
Simon
From: Brandon Allbery mailto:allbery.b@gmail.com>
Sent: 15 April 2019 22:54
To: Simon Peyton Jones mailto:simonpj@microsoft.com>
Cc: ghc-devs@haskell.orgmailto:ghc-devs@haskell.org
Subject: Re: Cabal woes
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 mailto: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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