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-rw-r--r--nixpkgs/pkgs/build-support/mkshell/default.nix4
1 files changed, 4 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/build-support/mkshell/default.nix b/nixpkgs/pkgs/build-support/mkshell/default.nix
index 3517e949f67a..5369301ea105 100644
--- a/nixpkgs/pkgs/build-support/mkshell/default.nix
+++ b/nixpkgs/pkgs/build-support/mkshell/default.nix
@@ -16,6 +16,10 @@
 let
   mergeInputs = name:
     (attrs.${name} or [ ]) ++
+    # 1. get all `{build,nativeBuild,...}Inputs` from the elements of `inputsFrom`
+    # 2. since that is a list of lists, `flatten` that into a regular list
+    # 3. filter out of the result everything that's in `inputsFrom` itself
+    # this leaves actual dependencies of the derivations in `inputsFrom`, but never the derivations themselves
     (lib.subtractLists inputsFrom (lib.flatten (lib.catAttrs name inputsFrom)));
 
   rest = builtins.removeAttrs attrs [