From d1107557350ae9101bfa387dd2af2cad541193cc Mon Sep 17 00:00:00 2001
From: Tim Vaughan <tgvaughan@gmail.com>
Date: Thu, 21 Jul 2016 20:29:26 +1200
Subject: [PATCH] Adding pair/list primitives.

---
 scheme-primitives.4th | 51 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/scheme-primitives.4th b/scheme-primitives.4th
index c99a0c0..c1f3626 100644
--- a/scheme-primitives.4th
+++ b/scheme-primitives.4th
@@ -211,3 +211,54 @@
 
     mod fixnum-type
 ; make-primitive remainder
+
+( = Pairs and Lists = )
+
+:noname ( args -- pair )
+    2dup 2 ensure-arg-count
+
+    2dup car 2swap cdr car
+    cons
+; make-primitive cons
+
+:noname ( args -- pair )
+    2dup 1 ensure-arg-count
+    
+
+    2dup car 2swap cdr car
+    cons
+; make-primitive cons
+
+:noname ( args -- pair )
+    2dup 1 ensure-arg-count
+    car pair-type ensure-arg-type
+
+    car
+; make-primitive car
+
+:noname ( args -- pair )
+    2dup 1 ensure-arg-count
+    car pair-type ensure-arg-type
+
+    cdr
+; make-primitive cdr
+
+:noname ( args -- pair )
+    2dup 2 ensure-arg-count
+    2dup car pair-type ensure-arg-type
+    swap cdr car
+
+    2swap set-car!
+
+    ok-symbol
+; make-primitive set-car!
+
+:noname ( args -- pair )
+    2dup 2 ensure-arg-count
+    2dup car pair-type ensure-arg-type
+    swap cdr car
+
+    2swap set-cdr!
+
+    ok-symbol
+; make-primitive set-cdr!
-- 
2.20.1