[Backport 2.33-maintenance] libutil/union-source-accessor: Barf on non-existent directories#14977
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internal-nix-ci[bot] merged 1 commit into2.33-maintenancefrom Jan 11, 2026
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Previously builtins.readDir would return an empty attribute set instead of barfing on non-existent paths. This is a regression from 2.32 for impure eval. (cherry picked from commit 4ab2cda)
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Automatic backport to
2.33-maintenance, triggered by a label in #14961.