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-rw-r--r--pkgs/top-level/all-packages.nix15
1 files changed, 15 insertions, 0 deletions
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index b18a27c4ed41..33491e615838 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -24,6 +24,21 @@ let
in
{
+ # A module system style type tag
+ #
+ # Allows the nixpkgs fixpoint, usually known as `pkgs`
+ # to be distinguished nominally.
+ #
+ # pkgs._type == "pkgs"
+ # pkgs.pkgsStatic._type == "pkgs"
+ #
+ # Design note:
+ # While earlier stages of nixpkgs fixpoint construction
+ # are supertypes of this stage, they're generally not
+ # usable in places where a `pkgs` is expected.
+ # (earlier stages being the various `super` variables
+ # that precede all-packages.nix)
+ _type = "pkgs";
# A stdenv capable of building 32-bit binaries. On x86_64-linux,
# it uses GCC compiled with multilib support; on i686-linux, it's