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In the local building case, there is many things which can through `BuildError`, but in the hook case there is just this one. We can therefore simplify the code by "cinching" down the logic just to the spot the error is thrown. There is other code outside `libstore/build` which also uses `BuildError`, but I believe those cases are mistakes. The point of `BuildError` is the narrow technical use-cases of "errors which should not be fatal with `--keep-going`". Using it outside the building/scheduling code doesn't really make sense in that regard. It seems likely that those usages were instead merely because "oh, this error has something to do with building, so I guess `BuildError` is better than `Error`". It is quite likely that I myself used `BuildError` incorrectly as described above :).
Nix
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