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<p class="MsoNormal">Aha! That works. I would never in a million years have found that by myself. Thank you.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But<o:p></o:p></p>
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<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">It is terribly mysterious that “cabal install hspec” doesn’t, well, install hspec.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">It must surely be a bug that “cabal install –lib hspec” simply crashes.<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Brandon Allbery <allbery.b@gmail.com>
<br>
<b>Sent:</b> 15 April 2019 23:03<br>
<b>To:</b> Simon Peyton Jones <simonpj@microsoft.com><br>
<b>Cc:</b> ghc-devs@haskell.org<br>
<b>Subject:</b> Re: Cabal woes<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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Yes, I think a lot of documentation will need to be updated because this. You want "cabal v1-install" with cabal 3.<o:p></o:p></p>
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<o:p> </o:p></p>
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On Mon, Apr 15, 2019 at 6:00 PM Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The instructions here
<a href="https://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" target="_blank">
https://wiki.haskell.org/Cabal-Install</a> just say “cabal install hspec” which is what I tried. Those instructions are pointed to from here
<a href="https://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" target="_blank">
https://wiki.haskell.org/Cabal/How_to_install_a_Cabal_package</a>, which in turn are pointed to from the main Cabal home page
<a href="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" target="_blank">
https://www.haskell.org/cabal/</a>.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I must be missing something.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Simon<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Brandon Allbery <<a href="mailto:allbery.b@gmail.com" target="_blank">allbery.b@gmail.com</a>>
<br>
<b>Sent:</b> 15 April 2019 22:54<br>
<b>To:</b> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com" target="_blank">simonpj@microsoft.com</a>><br>
<b>Cc:</b> <a href="mailto:ghc-devs@haskell.org" target="_blank">ghc-devs@haskell.org</a><br>
<b>Subject:</b> Re: Cabal woes</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">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). <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">On Mon, Apr 15, 2019 at 5:47 PM Simon Peyton Jones via ghc-devs <<a href="mailto:ghc-devs@haskell.org" target="_blank">ghc-devs@haskell.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’m trying to install ‘hspec’ on my WSL (Windows subsystem for Linux) system.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">But I fail; see below.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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.
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Alas, cabal then crashes outright, which should never happen.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">So I’m stuck. What should I do?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Simon<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ cabal --version<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">cabal-install version 3.0.0.0<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">compiled using version 3.0.0.0 of the Cabal library
<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ cabal install hspec<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">Resolving dependencies...<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">Up to date<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">Warning: You asked to install executables, but there are no executables in<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">target: hspec. Perhaps you want to use --lib to install libraries instead.<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ cabal install --lib hspec<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">Resolving dependencies...<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">Up to date<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">Distribution/Simple/GHC.hs:1959:5-56: Irrefutable pattern failed for pattern Just ghcPkgProg<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code"> <o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ which ghc<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">/opt/ghc/bin/ghc<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ which ghc-pkg<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">/opt/ghc/bin/ghc-pkg<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$<o:p></o:p></p>
<p class="gmail-m-5387463528054617257gmail-m-1866220934865054569code"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">_______________________________________________<br>
ghc-devs mailing list<br>
<a href="mailto:ghc-devs@haskell.org" target="_blank">ghc-devs@haskell.org</a><br>
<a href="https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-devs&data=02%7C01%7Csimonpj%40microsoft.com%7C9dba03cd18af405d806208d6c1ee1601%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909625657370807&sdata=3IAzng%2BFJbdlxyhT4atnSCCbfEmsOHHtsPNpA4e95ew%3D&reserved=0" target="_blank">http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">brandon s allbery kf8nh<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="mailto:allbery.b@gmail.com" target="_blank">allbery.b@gmail.com</a><o:p></o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">brandon s allbery kf8nh<o:p></o:p></p>
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<p class="MsoNormal"><a href="mailto:allbery.b@gmail.com" target="_blank">allbery.b@gmail.com</a><o:p></o:p></p>
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