docs: clarify Nix laziness comment

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copilot-swe-agent[bot] 2026-07-27 00:11:43 +00:00 committed by GitHub
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@ -6,9 +6,9 @@
}: }:
let let
# Include packages from a category only if that category is enabled. # Include packages from a category only if that category is enabled.
# NOTE: The package list expression is still evaluated (packages in Nix are # NOTE: Package list expressions are lazily evaluated, and derivations are
# lazy by default, so derivations are not built), so keep side-effecting # not built until needed, so keep side-effecting expressions out of these
# expressions out of these lists. # lists.
maybe = cat: pkgsList: maybe = cat: pkgsList:
lib.optionals (config.cats.${cat} or false) pkgsList; lib.optionals (config.cats.${cat} or false) pkgsList;
rPackages = (pkgs.baseRPackages or [ ]) ++ config.settings.lang_packages.r; rPackages = (pkgs.baseRPackages or [ ]) ++ config.settings.lang_packages.r;