From 2cabb50a38aa6d5cb16f726017b0f7a277dd499b Mon Sep 17 00:00:00 2001
From: Emile Clark-Boman <emile@agribit.com.au>
Date: Wed, 28 Jan 2026 13:51:51 +1000
Subject: [PATCH] add not fn

---
 nt/primitives/std/prim/fn.nix | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/nt/primitives/std/prim/fn.nix b/nt/primitives/std/prim/fn.nix
index 2ac65e6..98ebb14 100644
--- a/nt/primitives/std/prim/fn.nix
+++ b/nt/primitives/std/prim/fn.nix
@@ -1,4 +1,9 @@
-{...}: {
+{...}: let
+  inherit
+    (builtins)
+    isFunction
+    ;
+in rec {
   id = x: x;
 
   # syntactic sugar for curry flipping
@@ -15,4 +20,10 @@
     if x != null
     then f x
     else x;
+
+  not = f:
+    if isFunction f
+    then x: not (f x)
+    # WARNING: assume isBool holds (or fail)
+    else ! f;
 }