From 390503adc3035b18b0c97f22f40f107521817397 Mon Sep 17 00:00:00 2001
From: nodist <kevin.comas.git@gmail.com>
Date: Tue, 19 May 2026 15:45:59 -0400
Subject: type checking

---
 ack.kpl        | 16 ++++++++++------
 fib.kpl        | 17 +++++++++++++----
 fib_import.kpl |  2 +-
 3 files changed, 24 insertions(+), 11 deletions(-)

diff --git a/ack.kpl b/ack.kpl
index 1eb7694..f27af3e 100644
--- a/ack.kpl
+++ b/ack.kpl
@@ -2,19 +2,23 @@
 // Ackermann function
 
 `export ack : Fn[m; n] $ (
-    ? !=(`type m; `type n) {
-        `panic "m and n must be the same type"
+    t : `type m;
+    ? |(t != `type n; t != Int[Any; Any; Any]) {
+        `panic "m and n must be the same type of Int"
+    }
+    ? t = Int[Any; .signed; Any] {
+        ? |(m < 0; n < 0) { `return 0 }
     }
     ? {
         m = 0 { n + 1 }
-        &(m > 0; n = 0) { ack `call_sync (m - 1; 1) }
-        &(m > 0; n > 0) { ack `call_sync (m - 1; ack `call_sync (m; n - 1)) }
+        &(m > 0; n = 0) { ack `sync (m - 1; 1) }
+        &(m > 0; n > 0) { ack `sync (m - 1; ack `sync (m; n - 1)) }
         { 0 }
     }
 )
 
 `export ack_string : Fn[m; n] $ (
-    String $ ("ack("; m; " "; n; ") = "; ack `call_sync (m; n); "\n")
+    String $ ("ack("; m; " "; n; ") = "; ack `sync (m; n); "\n")
 )
 
 `is_main Fn $ (
@@ -25,5 +29,5 @@
             "Usage: "; args `get 0; " "; args `get 1; " <m> <n>\n"
          )
     }
-    `print ack_string `call_sync (I64 $ args `get -2; I64 $ args `get -1)
+    `print ack_string `sync (I64 $ args `get -2; I64 $ args `get -1)
 )
diff --git a/fib.kpl b/fib.kpl
index f049ba0..cb6b5ef 100644
--- a/fib.kpl
+++ b/fib.kpl
@@ -5,15 +5,24 @@
 */
 
 `export fib : Fn[n] $ (
+    t : `type n
+    ? {
+        t = Int[Any; .signed; Any] {
+            ? n <= 0 { `return 0 }
+        }
+        t = Int[Any; .unsigned; Any] {
+            ? n = 0 { `return 0 }
+        }
+        { `panic "n must be a signed or unsigned Int" }
+    }
     ? {
-        n <= 0 { 0 }
         n < 3 { 2 }
-        { `call_sync(fib; n - 1) + fib `call_sync n - 2 }
+        { `sync(fib; n - 1) + fib `sync n - 2 }
     }
 )
 
 `export fib_string Fn[n] $ (
-    String $ ("fib("; n; ") = "; fib `call_sync n; "\n")
+    String $ ("fib("; n; ") = "; fib `sync n; "\n")
 )
 
 `is_main Fn $ (
@@ -24,5 +33,5 @@
             "Usage: "; args `get 0; " "; args `get 1; " <number>\n"
          )
     }
-    `print fib_string `call_sync I64 $ args `get -1
+    `print fib_string `sync I64 $ args `get -1
 )
diff --git a/fib_import.kpl b/fib_import.kpl
index 6d900b3..478e8ab 100644
--- a/fib_import.kpl
+++ b/fib_import.kpl
@@ -4,5 +4,5 @@
 ( fib_string ) : `import "./fib.kpl"
 
 @ 0 .. 30 {
-    `print fib_string `call_sync n
+    `print fib_string `sync n
 }[n]
-- 
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