diff --git a/nt/primitives/std/prim/any.nix b/nt/primitives/std/prim/any.nix
new file mode 100644
index 0000000..f3e6d57
--- /dev/null
+++ b/nt/primitives/std/prim/any.nix
@@ -0,0 +1,11 @@
+{...}: let
+  inherit
+    (builtins)
+    typeOf
+    ;
+in {
+  enfIsPrimitive = type: value: msg: let
+    got = typeOf value;
+  in
+    got == type || throw "${msg}: expected primitive nix type \"${type}\" but got \"${got}\"";
+}