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<p class="MsoNormal">Ben and other friends<o:p></o:p></p>
<p class="MsoNormal">What is the approved way to build libraries with (and for) a compiler that I’ve just built?<o:p></o:p></p>
<p class="MsoNormal">I tried this:<o:p></o:p></p>
<p class="Code">bash$ cabal v2-install --with-ghc=/home/simonpj/code/ghc-9.2-branch/inplace/bin/ghc-stage2 streamly --allow-newer<o:p></o:p></p>
<p class="MsoNormal">but it failed with<o:p></o:p></p>
<p class="Code">Data/Primitive/Types.hs:273:844: error:<o:p></o:p></p>
<p class="Code"> • Couldn't match expected type ‘Word#’ with actual type ‘Word8#’<o:p></o:p></p>
<p class="Code"> • In the fourth argument of ‘shimmedSetWord8Array#’, namely ‘x#’<o:p></o:p></p>
<p class="MsoNormal">(This was for a compiler built from the ghc-9.2 branch.)<o:p></o:p></p>
<p class="MsoNormal">I’d like to be able to do the same for HEAD.<o:p></o:p></p>
<p class="MsoNormal">I need to do this to help with the numerous tickets asking about library regressions. For example, I want to be able repoduce
<a href="https://gitlab.haskell.org/ghc/ghc/-/issues/19557#note_348969">@harendra’s example</a>, but I can’t because I can’t build streamly.<o:p></o:p></p>
<p class="MsoNormal">Thanks!<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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