<div dir="ltr">I vaguely recall seeing that bug come up with respect to v2-install. And in fact am a bit surprised that 3 has been released, since this is highlighting that neither it nor the Haskell ecosystem is quite ready for it.<div><br></div><div>I'd also have expected (and thought I'd seen) "cabal install" in recent 2.x warn that it would be "v1-install" in the future.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 15, 2019 at 6:13 PM Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal">Aha! That works. I would never in a million years have found that by myself. Thank you.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">But<u></u><u></u></p>
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<li class="gmail-m_-7704206502593406082MsoListParagraph" style="margin-left:0cm">It is terribly mysterious that “cabal install hspec” doesn’t, well, install hspec.<u></u><u></u></li><li class="gmail-m_-7704206502593406082MsoListParagraph" style="margin-left:0cm">It must surely be a bug that “cabal install –lib hspec” simply crashes.<u></u><u></u></li></ul>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Simon<u></u><u></u></p>
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<p class="MsoNormal"><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 23:03<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<u></u><u></u></span></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.<u></u><u></u></p>
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On Mon, Apr 15, 2019 at 6:00 PM Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com" target="_blank">simonpj@microsoft.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">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?<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">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>.<u></u><u></u></p>
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<p class="MsoNormal">I must be missing something.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Simon<u></u><u></u></p>
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<p class="MsoNormal"><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><u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:6pt">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). <u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:6pt">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:<u></u><u></u></p>
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<p class="MsoNormal">I’m trying to install ‘hspec’ on my WSL (Windows subsystem for Linux) system.<u></u><u></u></p>
<p class="MsoNormal">But I fail; see below.<u></u><u></u></p>
<p class="MsoNormal">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.
<u></u><u></u></p>
<p class="MsoNormal">Alas, cabal then crashes outright, which should never happen.<u></u><u></u></p>
<p class="MsoNormal">So I’m stuck. What should I do?<u></u><u></u></p>
<p class="MsoNormal">Thanks<u></u><u></u></p>
<p class="MsoNormal">Simon<u></u><u></u></p>
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<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ cabal --version<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">cabal-install version 3.0.0.0<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">compiled using version 3.0.0.0 of the Cabal library
<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ cabal install hspec<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">Resolving dependencies...<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">Up to date<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">Warning: You asked to install executables, but there are no executables in<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">target: hspec. Perhaps you want to use --lib to install libraries instead.<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ cabal install --lib hspec<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">Resolving dependencies...<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">Up to date<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">Distribution/Simple/GHC.hs:1959:5-56: Irrefutable pattern failed for pattern Just ghcPkgProg<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code"> <u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ which ghc<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">/opt/ghc/bin/ghc<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$ which ghc-pkg<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">/opt/ghc/bin/ghc-pkg<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code">simonpj@MSRC-9870733:~$<u></u><u></u></p>
<p class="gmail-m_-7704206502593406082gmail-m-5387463528054617257gmail-m-1866220934865054569code"> <u></u><u></u></p>
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<p class="MsoNormal">brandon s allbery kf8nh<u></u><u></u></p>
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<p class="MsoNormal"><a href="mailto:allbery.b@gmail.com" target="_blank">allbery.b@gmail.com</a><u></u><u></u></p>
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<p class="MsoNormal">-- <u></u><u></u></p>
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<p class="MsoNormal">brandon s allbery kf8nh<u></u><u></u></p>
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<p class="MsoNormal"><a href="mailto:allbery.b@gmail.com" target="_blank">allbery.b@gmail.com</a><u></u><u></u></p>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>brandon s allbery kf8nh</div><div><a href="mailto:allbery.b@gmail.com" target="_blank">allbery.b@gmail.com</a></div></div></div></div></div>