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    <p>On a whim tried enabling it by default but it failed first
      because GeneralizedNewtypeDeriving is incompatible with safe
      haskell<br>
      and once I disabled GeneralizedNewtypeDeriving it failed with some
      error about missmatched kinds.<br>
      <br>
      I would welcome a patch doing this, but it's not a priority.
      Especially since it doesn't seem to be as simple as changing<br>
      the base language and removing some pragmas.<br>
    </p>
    <div class="moz-cite-prefix">Am 07/12/2023 um 14:29 schrieb Arnaud
      Spiwack:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAGwnsnnpzPxhOWks-C+GnQ4=rZ5-j4R+QCP_C4hvRPVb-w19oQ@mail.gmail.com">
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        <div>Indeed. I didn't realise the ambiguity in my wording.</div>
        <div><br>
        </div>
        <div>I'd like for GHC to be built, with Hadrian, using GHC2021
          as the base language.<br>
        </div>
        <br>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Thu, 7 Dec 2023 at 14:01,
          Tom Ellis <<a
            href="mailto:tom-lists-haskell-cafe-2023@jaguarpaw.co.uk"
            moz-do-not-send="true" class="moz-txt-link-freetext">tom-lists-haskell-cafe-2023@jaguarpaw.co.uk</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">On
          Thu, Dec 07, 2023 at 12:53:02PM +0000, Richard Eisenberg
          wrote:<br>
          > I think this is an excellent idea! So excellent, that
          we've already done it. :)<br>
          > <br>
          > When I try to compile with GHC 9.6.2 (what I have lying
          around), GHC2021 is in effect.<br>
          > <br>
          > Is there something different you were thinking of?<br>
          <br>
          I think Arnaud meant that compilations of GHC's codebase
          itself should<br>
          use the GHC2021 setting.<br>
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href="http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs"
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        </blockquote>
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      <br>
      <span class="gmail_signature_prefix">-- </span><br>
      <div dir="ltr" class="gmail_signature">
        <div dir="ltr">Arnaud Spiwack<br>
          Director, Research at <a href="https://moduscreate.com"
            rel="noopener noreferrer" target="_blank"
            moz-do-not-send="true" class="moz-txt-link-freetext">https://moduscreate.com</a>
          and <a href="https://tweag.io" rel="noopener noreferrer"
            target="_blank" moz-do-not-send="true"
            class="moz-txt-link-freetext">https://tweag.io</a>.</div>
      </div>
      <br>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
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