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Fix the workbench shell #4522

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Merged
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Oct 11, 2022
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Fix the workbench shell #4522

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9 changes: 9 additions & 0 deletions nix/workbench/shell.nix
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Expand Up @@ -78,6 +78,15 @@ in project.shellFor {

inherit withHoogle;

# The workbench shell uses cabalWrapped, which removes the `source-repository-package` stanzas
# from `cabal.project`. The idea is to use prebuilt ones provided by haskell.nix. However,
# haskell.nix is clever enough to not include `source-repository-package`s in the shell
# package db, because it knows that cabal will rebuild them. So you just end up with nothing!
# We can work around this by overriding haskell.nix's selection of which packages the shell
# is prepared for, so that it *doesn't* include the `source-repository-package` ones
# (the default is *local* packages which includes them, we select *project* pacakges which doesn't)
packages = ps: builtins.attrValues (haskellLib.selectProjectPackages ps);

tools = {
haskell-language-server = {
version = "latest";
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